Phil V Belton , TX December 20, 2014 Appliance: Model SEARS CONVECTION MICROWAVE Wifey says microwave is sparking and sparking! Followed the suggestions and washed off the wave guide cover first (it had some food soil on it). Put it back on and tried operating the microwave with nothing in it. Got a real big spark then. Discovered that there were some areas on the door that had paint scraped off. Looked like the power was all directed to this bare metal area causing the mica wave guide cover to really scorch then, with nothing else inside the microwave to absorb the energy. So I got some black appliance paint and lightly sanded the bare areas and painted them with a heavy coat. I also figured I would need a new mica microwave guide cover and ordered it from AppliancePartsPros.com They listed a shipping time average of 1.7 days, and we needed this microwave back in operation pronto! Well, Hallelujah & howdy, it got here in 2 days! I easily installed the part, checked the paint job (good). And wifey is back in there cooking up a storm! Thanks, AppliancePartsPros.com Phil 15 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes