William K Salem , NH October 27, 2015 Appliance: KitchenAid 27" Built-In Electric Double Oven Thermal Convection Lower Crispwave Microwave KEMC377KSS05 High voltage transformer was defective in my kitchen aid microwave causing a vibration during the heating cycle Replaced the transformer. Microwave is now working like new. I would like to thank you for a perfect replacement part and for the exceptionally fast delivery. I ordered it in the morning and it was at my door the next day. Please continue the excellent service, this country needs more businesses like yours. Bill Kady Read More... Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes Tools: Pliers, Screwdrivers