Jim M Fort Collins , CO December 16, 2025 Appliance: Frigidaire Microwave PLMB209DCB Frigidaire Microwave Plmb209dcb: Microwave was running but not heating. How to replace Cover. I looked at several YouTube videos as well as input on the AppliancePartsPro website. I replaced the magnetron, rectifier and microwave cover. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes