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If it is sparking the coating on the inner cabinet has come off and the unit is shorting to ground. You need to remove the rack and scuff down the bad spot and paint it with some good Krylon paint and then it should be fine.
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OK if the unit is all stainless you have an antenna failure on the magnetron tube or the stirrer assembly is not working or is greased up. Grease conducts electricity so if there is grease in the unit that can cause the issue as well.
The stirrer is located in the ceiling of the microwave and is what turns to deflect the microwaves around so that does not happen