James M Houston , TX August 06, 2020 GE microwave fan was on with the door open. Replaced the upper door microswitch which was stuck in. Easy to identify even without a meter. Needed a special secure bit for screws on back. Hardest part was probably removing the oven from cabinet mount. Read More... 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes Tools: Screwdrivers