Thanks for the tip OL' Yeller. I found both vacuum lines dry rotted at the unit, thought I had it fixed but no go, I'll Look for a Magnet.I went over the rest of the extruded screw strps today and pushed new Butyl in any place lacking and, will follow that up with sikflex to seal it all. I did find a small area that had been leaking at the bottom of the cab over. about 2" x 50" long. I was able to take a wood chisel and remove all of the bad wood and cut a new strip to replace the missing edge. I took fiberglass resin and soaked all the edges of the rotted ply wood and will fill the voids with foam, trim that flush and cover it with a couple layers of fiberglass cloth to finish the job. It should be a strong and permanent repair. I would be interested in how any one else has tackled this issue. I'v taken pictures of the steps taken but have no idea how to post or where to start a repair/rehab post on my project RV. well On to the next project.