No power on outside GFCI outlet

QuailRidge Park Model by Forest River 
I had a short on a extension connected to my outdoor gfci protected outlet. After that the line stopped working I replaced the plug but the short must created damage beyond that point because I have no power now. I checked the panel and all breakers are ON.

question:

where the power line that feeds the outside outlet is coming from? I need to find the broken connection between the panel and the power outlet outside.

Thanks