The brownout should only affect the microwave if it was in operation at the time. What brand is it? GE under the cabinet units are
notorious from problems with the magnetron unit going bad. They have a 10 yr warranty
but it only covers the part and the repair tech will charge $60-90 for a service call plus hourly labor. Total will be $250-300. Google GE microwave and you'll find plenty of unhappy campers.
I argued with them until they agreed to send me the part and I would get a qualified tech to install it.
My local repair guy told me how to do it and it was a breeze.
Moral of the story:
DON'T buy a GE.
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Joe
See Porsche run. Run, Porsche, Run:
`87 911 Carrera