It's could be a GFI outlet tripped at this point. Trip and reset all GFI outlets in the coach just to be sure.
Failing that, sounds like a loose connection at the circuit breaker in the breaker panel for the center of the coach.
Disconnect shore power and have generator off. Remove all covers in the breaker box so all wires to all circuit breakers are exposed. You may have to make other adjustments but, the object is to gain access so you can tighten each wire on each circuit breaker.
With that done, firmly trip each breaker by hand, then firmly reset the breaker.
Now connect shore power and see if it's corrected. If not, then the problem is most likely the first or second outlet in that circuit. You would then need to check the connections at each outlet in that circuit for loose connections.
John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox