Whirlpool Microwave over the range won't heat up

I have a 6-yr old microwave oven that doesn’t heat up the food anymore; other than the magnetron, is there anything else that might be causing this problem? Does anyone have any instruction for replacing the magnetron? I have unplugged this microwave for more than a month now, but someone told me that I still need to be careful in replacing the magnetron.

I would appreciate any input or assistance you can provide. Thank you.

Tom

Be advised, the website this guy is promoting states that they will contact you with progress about the repair progress of your microwave display and that it should be shipped within a couple of weeks. That’s a bald face lie. This guys cashs your check and then never gets back to you. Don’t use his repair service.