I suggest that it's nothing the amateur can fix or even attempt to.
The magnetron inside the oven, which generates microwave energy used to heat food, operates at an extremely high voltage and much care should be exercised if you don't wish to become a statistic.
Also, microwave energy is dangerous to humans, which is the reason that the oven's cabinet is made from metal. This ensures that microwave energy does not escape.
Elaborate shielding around the door helps to keep microwave energy to a safe level for operator safety.
Microwave ovens should be serviced only by qualified technicians, who know the risks and therefore take adequate precautions to ensure their own safety.
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