The chip may have been part of the control circuit for the heater, no way to tell without a schematic. That much corrosion can cause cross circuits and open circuits if it eats the copper away from the chip leads. A competent and creative repair tech would need a good look to know. Usually they will tell you to replace the board, which may not be a bad option to do yourself if you can get Jobo to send you one. Have you tried contacting Jobo to see about parts availability?
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Gary Beasley
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