GE Spacemaker - Not heating, burning smell

I have a GE Spacemaker over the range microwave (Model # JVM1440WD) that has stopped heating. It also emits a buzzing sound and a burning (electrical) smell whenever I try to heat something. Any idea of what could be going on?

I got this microwave used last year to replace another GE spacemaker that had stopped working. Wondering if it’s worth the hassle to fix it or should I just get a new one (as long as it’s compatible in the space). Thanks.

Have bought new door cables and latch, stricker. Door still will not latch. Would appreciate any help or ideas. Thanks