Based upon the description of the problem by the first tech who investigated it I would concur that it is certainly a plausible event. A metallic nut rolling across numerous solder traces could certainly wreak havoc. I've seen metallic objects (chassis screws) rolling around in Computer towers which generally results in the same issue that you probably have.
Not sure how handy you are, but if it were me, I would remove the control board from the unit and ship it back to KingDome for them to look at. It may be something as simple as a damaged solder trace, which can easily be repaired, or it could have toasted the cpu - which, at that point, it would be simpler (less expensive) to just purchase a new control board from them.
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94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
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