I think Chuck first needs to see if the CB trips again. I have many of that type on the plane and with age they tend to pop. I have replaced other CBs on both my coaches and I know other POG members have also dealt with breakers of that type or larger that just decided to trip for no reason.

I'm not ruling out funky power from the shore power, but I'm of the mindset that is inclined to focus on the root cause of the inverter failure, and when that simple fix is proven to not cure the problem then it is time to look more extensively.