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Micro was not producing heat.
Removed unit from above range. (A two person task.) Removed display panel, disconnecting wires from plugins. Removed outer cover to access magnetron. Used camera to take photos before disconnecting other wires. Replaced magnetron and reconnected wires, double checking with photo. Tested prior to reinstalling. It works fine.
Inside "cavity" bulb was a PITA. Need to remove top decorative trim (2 screws and tabs) to access bulb housing. Broke 1 screw tab so be careful (Wiggle it more). Acccess to bulb housing was made for younger smaller hands, attached by 1 screw. Remove screw, rotate housing, replace bulb. Reverse proceedure. Outside bulb, cake...1 screw, drop lens replace bulb, your done.
Unscrew (one screw) and take off the cover of the surface light under the microwave (the light over the stove). Firmly pull out the old light bulbs. Align the two prongs of the new bulbs into the socket and firmly push into the recepticle. Replace the cover and screw.
Opened the cover. Removed burned out bulbs. Ordered replacements which arrived fairly quickly. Forgot to turn off power to unit (didn't matter in the end!). Using the bubble wrap the new bulbs came in, I inserted the bulbs one by one into their respective sockets. Not really tricky but the surface light is in the back of the microwave so I had to lean over the stove to get all the way back. Once in the bulbs worked fine. Closed the cover. All back to normal.
After reading reviews that there was no power what so ever and a fuse replacement will solve the problem, I tried it. Replacing the fuse is very easy (and I am not handy at all). All you have to do is remove the microwave cover from the top by removing two screws, slide the cover to the left and pulling the cover off. Then remove the grill in front of you, by removing one or two screws. The fuse is in front of you, use pliers and be firm but gentle. Replacing the fuse is easy but it did not solve my problem.
the ones below were easy --underneath take out screws--take out old bulb--put in new one--the one inside a little more difficult--but not bad--take off panel on the front of microwave over door--the light is in a metal housing on the right--take out old bulb --put in new--wore rubber gloves putting in new lights--do not want to touch them with your fingers--i just watched the GE video on the parts website and it told me exactly what to do--if i can do it anybody can do it !