Since it sounds louder than before, it is probably a bad high voltage diode or magnetron.
If
it's within the magnetron portion of the warranty (usually 5-9 years)
but out of the original full warranty (usually 1 year), then your
manufacturer will cover the part cost, but not the cost to visit you or
the labor charge to do the work.
Here are some links you or someone you know can use for test help, but read their safety warnings first:
http://www.gallawa.com/microtech/diode.htmlhttp://www.gallawa.com/microtech/mag_test.htmlSears may send you a magnetron to install yourself since it's under warranty. For that or warranty service, contact Sears at
http://www.sears.com.
You can save about $75 by taking it to the shop yourself, as opposed to an in-home service call.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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