Looking for the white plastic clips that shelf hangs on.

Try small cable ties if they sit on pegs sticking out you can then cut the ties for removal.

Go to any Home Depot store and check the appliance section for technical specs on the Whirlpool models. A salesperson can easily obtain that info for you because they have that info right there.

Most stainless steel refrigerators come in 22 gauge and have various color finishes to choose from.

Yours came in several finishes (including two types of black and white finishes) but if your finish is stainless steel, then most likely you have either the Monochromatic Satina or Monochromatic Steel. You can tell by looking at the surface. The "Satina" has a more refined and smoother look to it than the other one listed.

Hope this helps!

Pen

P.S. They're no longer making that model with that finish.

The freezer should not be totally be full otherwise the cooling system will not succeed to reach its design temperature. If the shelve is still bending, get a piece of maple about 1x2" and attach it to the shelve at each end with a piece of nylon rope.

You should have pins or clips that rest in a standard that you can take out for adjustments. Simply pop them out . If yours are made onto the shelf itself, then raise up on the front side of the glass then pull it out from the post or standard.

Adjust the thermostat switch to different positions and see.

replace gromments and reduce the weight that you put inside the shelf/basket.

I have exactly the same problem and it is mostly because of the cheap plastic support brackets. I'd like someone to to offer a cheap way to "rig" it so it will support the weight of the shelves when full. Glad tyo know I am not the only one.

Is the condenser clean? If it is you may have a refrigerant leak or an inefficient compressor.

This link might help you troubleshoot
Freezer Frost inside Symptom Diagnosis Sears PartsDirect
The lucky solution is if the door seal or inner plastic liner need to be placed/repaired (this lets warmer air into the freezer causing frost and poor cooling).
But you can also see from the link that your symptoms could be caused by other electronic related things...more of a challenge to fix...
Helpful?
Good luck on your troubleshooting

look to see if the shelves are in fact not shelves but evaporator coils . if the shelf is connected to small tubing, then that tubing flows freon that freezes the shelf. if its clearly not connect to any tubing or piping then its just a shelf and gets residual cold from evaporator shelves. if it is connected to tubing like the others and not getting cold then you have whats called a restriction. . particles have plugged the tubing and no freon is feeding the shelf. if that is happening then consider having a pro recover the gas , unplug the tubing , replace the drier and recharge it. if its an older unit and you are getting by then maybe not worth the expense.