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Thank you for the reply. I'll ask around the marina. I noticed there are many posts about this board. I decided to completely rebuild the main (LED) board. Once I have a working board, I will post how others can order a replacement board and list of components to make their own.

I am repairing the system monitor on my 1989 390 EC. The main board is corroded but the components are accessible (not potted). I think I can replace a few resistors that rusted off and a few wires over the corroded traces. The remote termination board has a burned out resistor which appears...