Yup!
Whatever you do, don't run a microwave w/o a fan, it also cools the magnetron, the
heart of the microwave.
Another fix:
Yrs back I had a microwave at the cottage that would die when you pushed 'start'.
Turned out the processor chip in a pocket on the circuit board had tin flashed pins
that were all black from oxidation. Gently popped it out and cleaned the pins then cycled
in & out of the socket 3 times. Then re-assembled, all OK now for 10 years now!