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Looking at your pictures, I think you have the trouble-prone second generation PDP with the no-lead solder. Suprman knows a lot about these, I don’t. These boards have been known to have bizarre intermittents like you describe.
Sounds like intermittent connections over on the LBCD under the spare tire. 12 and 24 volt battery cables from the disconnect solenoids lead to this box and can be corroded at the ring terminals.