Look at the plug-in receptacles, probably in the bathroom, to find one that is a GFI receptacle. It will have two small square buttons between the two plug-in points. Each circuit in the coach should have one. We have two in the kitchen, one in the bathroom, one in the bedroom, and probably one or more in the basement.
One of the two small buttons is for testing the GFI, the other is for resetting it. If it's tripped, then the reset button will be pushed out. Just push it back in to reset it.