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Mrs. Lee may be on to something. It is permissible to share a single neutral wire between two circuits as long as those circuits are on different legs of the 120/240. Circuit breakers directly across from each other are on the same leg and and the legs alternate as you go vertically. Typically the circuit breakers for two circuits sharing a neutral would be right next to each other. Those two circuits each see 120 volts until you lose the neutral connection, then the two circuits are in series across 240 volts. If each circuit has an equal load they would still each see 120 volts. However, when the loads are unequal that 240 volts will be split unevenly, which could have subjected the dishwasher electronics to a voltage much higher than 120.
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