If the leak persists after resealing the access door, check the marker lights and running lights. I had a leak in my old 5er and couldn't' find it. One day after a rain I was looking again and spotted the marker lights were half=full of water. I removed one light and the water had been running through the backing plate where the wires entered the outside wall. The backing plate was sealed with putty to the trailer, but when the lens filled with water up to the wiring hole it ran inside the trailer wall. I solved this by drilling a small hole in the bottom of every lens to prevent any accumulation. Look at your lens's, does any have a water line mark halfway up?
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"