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This is a Norcold 6062 model? And this was in storage and not even on at the time?
I am attaching a link to the Norcold Service Manual which covers this model. Print out a copy so you have it. It does include testing on the systems and board. When you replaced the board before, was it an OEM board or an aftermarket board made by Dinosaur Electronics? http://bryantrv.com/docs2/docs/600.pdf
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?