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The fan function works great, the lighting function (casting light on stovetop) works great, the light inside microwave works great. The actual microwaving function doesn't work - sometimes I can plug and unplug like 25 times to get "minute plus" to work to heat up something (slightly). I see Parts Dr offers both a "control board" and "main control board" I am wondering if one of these controls the microwave function specifically - I'd be terribly obliged to get some counsel here - kind thanks