Cover replacement where can I find the cover for the grill

The support page with free manuals is here.
http://shared.whirlpoolcorp.com/product_literature/search_results.jsp?searchTerm=MMV5208WW1&siteCd=WHRCOM&userType=Consumer

The owner's manual says:

Cavity light: The cavity light bulb is located behind the vent
grille at the top front of the microwave oven, under the bulb
cover, and is replaceable. Remove two screws on the vent
grille, tilt the grille forward, and lift it out. Open bulb cover and
replace bulb. Close bulb cover, replace vent grille, and secure
with screws.

Cooktop light: The cooktop light bulb is located on the
underside of the microwave oven, and is replaceable. Remove
bulb cover screw, and open the bulb cover. Replace bulb,
close bulb cover, and secure with screw.

To remove the grille, see my video at microwavecontrol.com.

The cooktop light bulb(s) is(are) located on the underside of the microwave oven, and is(are) replaceable. Remove bulb cover screw, and open the bulb cover. Replace bulb, close bulb cover, and secure with screw. Cavity light: The cavity light bulb is located behind the vent grille at the top front of the microwave oven, under the bulb cover, and is replaceable. Remove 2 screws on the vent grille, tilt the grille forward, and lift it out. Open bulb cover and replace bulb. Close bulb cover, replace vent grille, and secure with screws.
For more information, your owners manual can be viewed here (scroll to the bottom of page 4):
Maytag MMV1164WB Owners Manual Page 4

Is this a countertop microwave or an over-the-rang (OTR) microwave? If it's a countertop model, you need to completely remove the outer case to get to the lightbulb. If it's and OTR microwave, there usually is an access cover located behind the grill vent. You can remove that grille vent by removing the 2 to 4 screws above the grill vent. Then either slide the grill vent 1/4" to the left to remove it, or else (depending on the model), just pull out the top of the grill vent, followed by the bottom. Then you should be able to see the lightbulb access cover. Usually there is 1 screw that you have to remove. But unplug the microwave before you to any further! Now remove the screw, lift up and remove the cover, and you should be able to get to the light bulb.

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

Are you talking about a protective cover or the top part of the grill? If you are talking about a protective grill cover, you can get one from Mighty Covers. They have protective covers for all kinds of grills.

You can download owner's manuals and installation instructions for several brands (including Amana, Frigidaire, Jenn-Air, Kitchenaid, Litton, Maytag, Roper, Tappan, Thermador and Whirlpool) here.

Enter it as MMV1153WB0 (no dash, zero on the end, not "oh")

Or just get it here, to be more exact.
On page 4, it says:

"Installing/Replacing Filters and Light Bulbs
■ Grease filter: Grease filter is on the underside of microwave
oven. Clean monthly. Slide the filter away from the tab area,
and drop out the filter. To reinstall, place end of the filter into
the opening opposite the tab area, swing up the other end,
and slide it toward the tab area.
■ Charcoal filter: The charcoal filter is behind the vent grille at the
top front of the microwave oven. The charcoal filter cannot be
cleaned, and should be replaced about every 6 months.
Remove 2 screws on the vent grille, tilt the grille forward, lift it
out, and remove filter. To reinstall, place the filter into its slotted
area – wire mesh side up, replace vent grille, and secure with
screws.
■ Cooktop light(s): The cooktop light bulb(s) is(are) located on
the underside of the microwave oven, and is(are) replaceable.
Remove bulb cover screw, and open the bulb cover. Replace
bulb, close bulb cover, and secure with screw.
■ Cavity light: The cavity light bulb is located behind the vent
grille at the top front of the microwave oven, under the bulb
cover, and is replaceable. Remove 2 screws on the vent grille,
tilt the grille forward, and lift it out. Open bulb cover and
replace bulb. Close bulb cover, replace vent grille, and secure
with screws."

HINT: Unplug the oven before removing or installing the bulbs, or you may need this service.

You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites. Hope this covers it.

William E. Miller
[email protected]
http://www.microwavedisplay.com

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Put a piece of cardboard next to the speaker to protect your boats finish. Then use a flat bladed screw driver to gently pry the grill covers off. you may need to work your way around the perimeter, with a little bit of effort it will pop off. There will be 4 screws under the grills holding the speaker to the boat which are easy to remove.

we have these in our store, they are not difficult to get.

I think the key is pulling the vent to the left.

From page 36 of the online version of the owner's manual, which also mentions the active grille's presence on some models:

Oven Light

Replace the burned-out bulb with a 120 volt, 20-watt
halogen bulb (WB36X10213), available from your
GE supplier.

To replace the oven light, first disconnect the
power at the main fuse or circuit breaker panel
or pull the plug.

Remove the top grille by taking out the screws
on top of the grille that hold it in place and
sliding the grille to the left (opening the door
makes grille removal easier).

Next, remove the light cover.

On some models, the light cover is located
in the center of the top opening. Remove the
screw that secures the light cover and lift the
cover off.

On some models, the light cover is located at the
left of the top opening. Lift the cover off.

Pinch the clips that hold the light socket in
place and lift the socket out.

Remove the bulb from the light socket by
pulling straight out. Replace with the same size
and type bulb, then replace the light socket and
cover.

Replace the grille and screws. Connect electrical
power to the oven.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Hello Rod01,
After some research, I found no parts resource for your GR20BW bun cover (I'm not saying that such a resource doesn't exsist though). So other than replacing the grill or repairing (if it's broken) your existing cover, that buying a used one at an online auction site (or wherever you can find one) for parts (if the cover is intact on the parts grill) would be a place to start looking. I tried and didn't find anything for your GR20BW, but did find a few GR10BW grills.
I hope this helps, and Good luck.

Are you looking for a protective cover? If so, try the grill covers here. They have a huge selection and i know you can find one that fits this grill.