BTW - I forgot to mention that there is also a blackened / charred area on the inside of the MWave which I am sure what the tip was arcing to. This cannot be repaired or replaced as is just part of the wall itself. I worry that a new tip or magentron unit will just also arc to this damaged area. I wonder if initial cause was someone nuking something with metal in it and wandered off. House was a foreclosure...............