A common problem on our "neo-classic" models. Deralde summed up the solution nicely.
Our bedroom and bath became untenable a couple of years ago. We floundered around on this site and others. A number of solutions that were non starters for us, such as decorative tacks in patterns.
It is, after all a headliner. Luckily, we knew of a local guy, Angel's El Toro Upholstery. He was able to remove the OEM vinyl, rub off the crumbling backing, glue new backing and reinstall.
Looks like we may have him do the rest in a few months. The bed/bath was $900 then. But then was then, now is now.
Fair Winds and Following Seas
Terry & Rosalina
2007 Winnebago Journey 34SE
Retired Navy Mustang & Navy Wife