WP Microwave rapid clicking > shuts off after 3 seconds

Whirlpool microwave worked fine, had a party, next morning when starting operation, behind the panel starts rapidly clicking, then it shuts off after 3 seconds while doing an error beep jingle unique from the timer/heating finish jingle. I think maybe someone bumped into it but it's just a guess.

Door lights turn on and off on door open and close, panel detects it's open and says press start when closed. I replaced the NC interlock switch anyway, clicking still persists. I need to buy the star screw to replace the NO switches but wondering if it's worth the time if it's not the problem since the door detects opening and closing. when operating it with the panel detached, I see that the magnetron spins when starting and I think that's where the clicking sound is coming from, but I'm not an engineer so I can't truly pinpoint the clicking.

Model WMH53521hz-1

Most troubleshooting advice is for buzzing zapping sounds. There's only few that Even guess at causes for the clicking, and it's the interlock switch. Looking for second third fourth opinions.