@lktrshn anytime a microwave is not heating, '''runs but doesn't heat or turns on but doesn't heat food''', start by replacing the interlock (switch). Even if this will not immediately resolve the problem it will always give you a known-well starting point for further troubleshooting. Your MW has three, two for the lock and one to monitor the door and report the state of the door to the control board. Monitor switch is part number '''WB24X817''' and reference number 607 the terminal micro switch is number 604 and part number is '''WB24X10029'''
After that it can get costly since it may be the control panel, but wait with that until you determined it is not your microswitches
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Please remember that your MW has some high powered components and you definitely do not want to touch anything that carries those fatal currents. Watch the capacitors! Could be a shocking experience.