Very good, Tom!
I just went out and ran my 2nd AC in the 3400. Same problem - showing 121.3 before running - 108.4 (This in itself seems a significant initial drop to me) when initially switched on (Low/AC on this 13.5K Low Profile, non-ducted unit). In 4 minutes it slowly dropped - with slight fluctuations - to 104.9 at which point, that was all I needed to see and I switched it off.
It is currently 85 and humid outside, which makes it difficult/impossible to work inside the Montana w/o AC. I will try to pull that panel and look and the wiring as soon as possible.
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