Alan Z Beavercreek , OH November 09, 2018 Appliance: General Electric Microwave PVM1790DR1BB Ge Microwave Pvm1790dr1bb: Internal microwave fan coming on when door opened. How to replace Locker Holder Asm. Replaced switch assembly and 3 switches. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes