Just I suspected water leaking from clogged window channels (before I owned camper) has rotted the O.S.B. flooring on the back of the camper, I was able in one spot to puts a pocket knife clear thru the flooring! Now what, the rest of flooring is good. Any advice, suggestions? I know the flooring and paneling will have to be remove and new installed, luckily the rear of the rig has a fiberglass cap much like the fronts of most fifth wheel’ do. Any input is appreciated.