I'm looking for info on repairing a 1991 Jayco Pop up slide-in truck camper. The camper is in excellent shape except where water got into the roof through a break in the front top seam of the pop-up, cabinets, fridge & stove look like new, floor is solid and dinette cushions show no wear! I'm wondering if repairing the ceiling from the inside and replacing the chipboard that's between the roof and the ceiling with something better, maybe marine plywood, is feasible and where can I get schematics for a camper this old? I printed off the only Jayco Owners Manual that I could find but it's mostly for PU trailers! Any info would be appreciated!