Hi this is how you can fix yourself.
Disconnect shore power
Remove plate from receptacle (if there are no screws it will pop off if you place a screw driver behind plate and pull out on it, top and bottom)
Remover receptacle from outlet box. If there is no box they are flip wings that attach to wall board.
Look for any loose wires. (If it was the kind with no box then you will have to snap the receptacle apart, clips on side of receptacle)
If you have any burn or hot spots the receptacle will need to be replaced. Receptacles installed in boxes can be found at a local Lowes or home depot. If it is the type that has no box they can be found at a camper store or and mobile home service company.
Reinstall receptacle, problem should be solved.
Hope this helps
Robert Whitlow Licensed NC Electrical Contractor
2007 GMC 2500 Duramax Crew Cab LB
2008 5th Wheel Cardinal 36LE