Since you are out of warranty, you will need to track down the problem. My first suspicion would be there is moisture behind the paper. Is there any smell of dampness in the coach? It may just be some bad paper coming off the wall.
Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer