Ok I'm looking for advice on a leak on my 77 31' Landyacht. I have a leak on the street side under all 3 windows. I pulled the inner wall and was expecting to find leaking windows. But at the C- Channel between the wing and first window there is an old repair, lots of Vulkem and Olympic rivets. There is a hole just at the top of the belt trim that is open about 3". also there is a gap in the C-channel just aft of the rib in this area is that normal. I was thinking that I could work a patch behind the C-channel and skin and rivet it in. I will be replacing the sub floor completely and dropping the forward pan. While the sheets look ok the moisture meter says its wet.