"Bob Scheurle" wrote in message
I tried reseating the two main connectors on the Power Module board
(WB27X5315 according to the GE parts web site), but that didn't help.
That board is still available. Do you think it's worth spending $85 to
replace that board? Exactly what does it do?

You can buy a new mw for $42 with more features than what you have now. You
can buy an 1100 watt mw for $69. IMO, it is dumb to spend that much money
on very old technology when you can get newer, cheaper.