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check the door switches....i had an over the oven micowave with a bad door switch....thing is the switch cost 35.99 online and i bought a counter top microwave for 39.95 at walmart
From the decription that you have provided, the magnetron is highly suspect and is the most expensive part to replace, cheaper to replace the microwave oven in the long run.
Could be a short in the HV system for the magnetron--usually the HV diode. Another possibility is the metal stirrer fan in the waveguide above the oven cavity may have a shorted bearing (plastic). The short occurs internally within the bearing.
THe microwave has to be removed from the wall and then the outer cabinet has to be removed to get to the bulb. Do not do this with the unit plugged in and do not do this if u don't know how to work on a microwave as there is a shock hazard.
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