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Good afternoon. My name is ***** ***** I'll be assisting you with your microwave today. That sizzling noise you get is the magnetron arcing out. Unfortunately the magnetron which is the part that produces the microwaves to heat the food is shorting out and needs to be replaced. That is why the unit isn't heating anymore as well. The part costs about $100 and the microwave will need to be completely uninstalled and the outer shell removed to access and replace the part. Below is a link to the magnetron.
CLICK HERE for magnetron
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