K V Hemet , CA November 12, 2015 Appliance: Model DECOR MICRWAVE Burned waveguide cover in microwave Turned the microwave on its side, removed the 3 screws holding the old waveguide. Removed the old one. The "waveguide" is a piece of mica which I found out later is available at my local hardware store for $3. I then installed the new one in the same spot and screwed in the screws. turned microwave back over and it works like new! Read More... 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes Tools: Screwdrivers