Ha, been all over that roof! I know that I still need to find all of the leaks but right now I'm just wondering if there are also drain holes that I need to clear. The screw head from which water seeps behind and into to the coach is inside, where the fiberglass coach is secured directly to the frame of the cab. There are a half dozen or so of these screws that I have access to-- behind the passenger seat. I got to them by removing the upholstered piece that covers the transition of coach to cab. There are about a half dozen or so of these screws going down to the floor. Two of these screws (the ones water seeps in from behind) don't seem to tighten but do not appear to be backing out either. There is not and appears to never have been goop or Dicor or anything on the screws or in the holes. I could cover them with goop but the water would just seek another outlet ...probably into the coach. There is a heavy black weatherstrip of some kind used at the edge of the fiberglass but that does not appear to be leaking through into the coach. Probably not explaining well. I'll add pics later. Heavy rain again now.