"Jerry G." writes:

If you contact GE parts directly they should be able to help you.

Won't they want to charge you $189.50 for a magnetron that can be purchased
for $40 from a service parts supplier. Or is the mag in that oven special?

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In your case, the power transformer, rectifier, and capacitor should be
verified. I have seen failures in all these areas when having the
problem you are describing.

Jerry G.