When trying to cook, an electrical arc discharges from a sopt in the top inner surface of the enclosure, downwars tord the bottom of the oven interior. Problem began intemittently, and would only leave a small spot of soot on the top of the oven. After cleaning the soot, and covering the item being cooked, the oven would operate normally. Now the problem has gotten to the point where it is constant, and there is a hole, maybe the size of a dime, burned through the top inner surface of the cooking chamber. Can this be repaired, or is it "toasted"?
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