Ralph N Chicago , IL November 10, 2014 Appliance: Model JES1351 WB001 (SAME PART AS WB002) The microwave oven was sparking for no apparent reason I replaced the plate inside the oven that is variously called the "wave guide" and the "canopy." There was scorching on the inside of the old plate, invisible without removing it. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes