GE PT970SR3SS Microwave/Oven Combo Blows Fuse

Microwave Repair
1

Brand:GE
Model Number:PT970SR3SS
Main Symptom:Blows Fuse
What happens & when:Oven works fine,but microwave keeps blowing fuse. Quit working mid-cycle. Replaced fuse and fuse blew again when hit start. Replaced 3 switches and fuse again, but problem persists.

Error Code (if any):
Parts or tests already tried:Replaced upper door, monitor and lower door switches, and fuse.
Photos / video link:

2

Hello, being you replaced the door switches, I think something on the control board is causing a high amp draw and tripping the fuse. Typically the monitor switch causes this symptom. If a relay on the board is stuck, it will also cause the fuse to blow.