James B Saint Augustine , FL June 17, 2015 My 16 year old built in microwave was arcing and burned a hole in the little plate called the wave guide The paint around the waveguide had come off in a spot and this was causing the arcing. Touched up the paint around the wave guide with microwave touch up paint. Replaced the waveguide. Good as new. No more acrcing. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes