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Can you give me the Model Number? It is normally found inside of the microwave.
Or at least the brand name.
OK. What happens is that the light gets hot and over time, degrades. When you try to unscrew it it, breaks and shorts out the two leads. This causes overcurrent on the main board and burns the board out. Thus the main board would likely need to be replaced. This is often not economical since you can replace an above range unit for $200 - 300.
I hope that this helps.
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