Hugh B Lighthouse Point , FL May 25, 2021 Appliance: KitchenAid 27" Built-In Electric Double Oven KEMS377DBL4 Kitchenaid Oven Kems377dbl4: Magnetron. How to replace Magnetron. Pretty straight forward with reasonable access on right side facing unit. Was not prepared for how much unit weighed. Taking the oven door off helped greatly. Maybe two hours with parts on hand. Do-It-Yourself Rating: Repair Time Estimate: 2+ hours