Most probably one or more of the following are not functioning:
1)Door switches
2)High voltage diode
3)High voltage capacitor
4)Magnetron
You need to check amperage to magnetron withi multimeter. If it's less then 14 Amp then it's most probably the magnetron. If more then 14 Amp then it could be high voltage capacitor and diode. If amperage is ok then door switches would need to be replaced first, but it still could be some other problem.
Hope this helps,
Dmitriy
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Active Appliances, Inc. Professional appliance repair services in Los Angeles and Ventura counties.
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