I know our A/V circuit also runs down the driver's side first also Larry, powering the "buffet"/dinette area before reaching the front cap. Make sure there's no outlet in a bay below that may be T'd off the computer or dinette area - bay outlets are considered "wet exposure", so heed Steve's advice. Like yours, our 30 amp box is all GFCI breakers, but have never had problems.
One thing you might check is the condition of the surge protector/power strip stuffed in the back of your A/V cabinet. If it's a cream colored Belkin, at least one BAC member had big problems out of his a while back when it overheated. Ed Buker recommended metal cased power strips instead of plastic ones that can melt and burn more easily.
I say that because you weren't having problems before, then the same issue even with a new GFCI breaker. Your electrician's "glitch" may not be all that small. Things in the cap get hot, especially when you're parked facing the sun. I'd like to add more vent ports and fans to mine. The TV got so hot one year that it's internal on/off component started turning itself on, so we couldn't get it to stay off. Until I get a new more modern TV, we have to flip the breaker to guaranty that the TV will stay off now. If I want to use dinette outlets/lights, I have to unplug the A/V components or struggle through the wire bundles to unplug the TV from the power strip instead of popping the breaker. PitA.
But check out or just replace that strip, just in case.
Joel