I need instructions on how to replace the light bulb for the interior microwave oven, not the exterior light that illuminates the range. I called GE answer center and they were totally useless and referred me to their parts department which was closed. Obviously, this is a task that requires some disassembly of the oven since there is no user access panel inside the oven.

You can get to it by removing the top vent that opens when your cooking. there are 2 screws on top that hold it on, remove the screws, and with the door open slide the grille to the left then off. You should now be able to get to the bulb. Keep us posted

There are 3 screws on top of the microwave near the front to remove the grill. After the screw are removed, make sure the door is open and shift the grill slightly to the left to slide the lower tabs in their slots, and pull the grill straight out. Then remove the middle flat (no air vents) access plate. You will not be able to see the light, but if you see where it's located from inside, you see wires go to that box above. Use small fingers to follow the wire until you feel the bulb. Pull the bulb out of the box. Replace the bulb in the socket with a G8 20w xenon bulb. Don't touch the bulb directly, the oils on your hand can make the bulb overheat. Good luck getting the bulb back into the light box. Replace your access panel and grill.