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I know you cant open the door but can you check these other places for the full model number ?
It is a built in Kenmore microwave/oven combination. The instruction manual says Models 49425, 49429. I'm assuming it's one of those.
The bottom of the manual has other numbers. Maybe they will help.
I had cancelled my question and solved the problem myself before you answered. Actually I only left the circuit off about 20 seconds and used the oven again within a half hour. Everything seems fine not, but the fan sounded so rough after being on so long, it may have to be replaced.