Originally Posted by homerbw
check the outlet in the restroom area
I agree with this and seem to recall that in my 2002 Condor the GFCI is in the bathroom and controls the outlet at the sink also. If the new GFCI still trips you need to make sure you have found all the non-working outlets. In my coach, what the breaker panel says it not was is. Check every outlet.
After you find all the non-working outlets here is what I would do- disconnect all power, make sure nothing is plugged in to any outlet, one-by-one remove every non-working outlet and inspect all the connections. If you are lucky you'll find a loose connection or two.