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Bottom lights are controlled through relays on the main control board which is mounted on the back of the touch pads (control panel).You can check and see if wires are touching each other on the board but my guess is the board is defective and needs replaced.
You can find and order them easily by entering your full model number from the tag in or on the unit and also find helpful exploded view diagrams here.
Also, your owner's manual should cover that, and they usually have the GE part number inside. You can download them here.
Note that these are likely halogen bulbs, so do not handle them with bare skin. The oils on the skin will reduce their service life.
If after replacing the bulbs, they still won't work, won't shut off, or you have trouble with the fan or turntable, the filaments may have shorted, causing a surge which damaged your control circuit board.
We see (and repair) this
a lot. The problem is on the control panel, which
we regularly repair nationwide
by mail for $39.95 postpaid in about a
week or so.
our Web site, you can get details of our
service, plus we have a video
available showing how to remove a typical
over the range control panel assembly in under 5 minutes.
This light failure often
occurs when a bulb goes out and the filament
shorts, or when the bulbs are removed or installed without first
unplugging the oven from the power line. Either can cause such a
failure on the controller.
The lights can can be
inoperable or stuck on or stuck in "night light" mode. Sometimes this will similarly
affect the fan operation or inside light, too.
happy to help you with free advice and we'd appreciate your thoughtful
rating of our answer.
If one of the surface light bulbs burnt out it may have shorted out the control board. Take the control board out and look for a burnt spot on the board. It may be able to be repaired with a drop of solder or solder in a jumper wire. Or you can purchase a new board, which may cost more than you want to put into the microwave.
That would almost certainly be a problem on the control circuit board.
If the bulbs happen to short / blow out or if they are removed or installed while the microwave is still plugged in, there is often an arc which causes damage to the board.
We repair regularly these boards for such problems for $32.50 nationwide.