Me too, and here's the solution...
I have a 1983 First 32 that has the same problem, mostly in the aft quarter berth. Once the foam backing has deteriorated, forget trying to re-glue it back up. The vinyl will adhere closely to the fiberglass liner and you get a wavy appearance (I did this in the galley area and head, and will have to re-do eventually). The solution is to buy new foam-backed material and use the old pieces as patterns to recut new ones. This is what I'm going to do for my quarterberth. The material can be bought at www.sailrite.com, along with the appropriate adhesive. The only part I will have to have done is to have a canvas shop sew the "finished" edges. Its a big job, but not something you can't do with a little determination and elbow grease! FYI, I figured 8 yards of 54" wide material (the only width, I think), at like $13/yard. So for $104 plus glue, some expense at the canvas shop, and some elbow grease, it'll be like new!Good luck!Tim