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You seem to be able to reset the board for the machine by unplugging it. If the unit works correctly afterwards it points to either the board itself or a bad connection with a wiring harness or component.
You can dissassemble the board clean and inspect the board and all wiring and sometimes that will resolve the problem. I would reccomend this before considering purchasing a new board to resolve.
You would be looking at part number 2 on this diagram -
This should help with disassembly also.
Let me know if you need any more informaiton. I'll be back late tonight (10 pm eastern).