Checked to see why the shore power socket was held by only two screws today....oooopps
The socket was installed off center so two screws were holding air.
But that wasn't the worst thing. The ground wire had shorted with the hot wire at some time and burned off.
The original installation had to much of the outer insulation removed so the strain relief clamp pinched the hot and ground wires resulting in the short. All fixed now and replaced zinc screws with SS.