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Hello, there is an *intermittent short in one of the peripheral devices that plugs into the board, very very difficult to locate ... as most of the time the defective device will checkout OK when you test it.
This is why we have so many older HVAC techs with no hair.
Suggestion, wiggle each wire individually, with tweezers, so you do not bump any adjacent wires if you can do this with the unit running, when you cause a short the fuse will blow.
Stay in touch without a time limit as needed.