Outside "Entertainment Center" 120v Outlet Issue

Well, unfortunately this will remain a mystery. I checked all of the outlets I could get to, reset all of the breakers, and even tried replacing the troublesome outlet itself. All to no avail - there just isn't any power going to that outlet. We've decided to trade our old girl in on a new Jayco Seneca. I let the dealer know about the problem and will leave it up to the experts to figure it out.

Thanks everyone for your help and advice!