BadgerMcAdams wrote:
Second what Diazr2 says about it being the glue. The wallpaper is glued to the luan substrate (or whatever they use) and over time the glue can degrade. This can cause the wallpaper to bubble or wrinkle. I have a 1991 SixPac slide in camper. When I got it, the wallpaper was peeling and bubbling on almost all the walls. I pulled off the loose stuff, used a heat gun to remove the remainder, then painted the walls. It turned out fine.
Something to consider...But I have my fingers crossed it isn't water.
This makes me feel a tiny bit better. The wall is not spongy and there is no smell of mold or mildew. It sounds like we are going to need a moisture detector to see if this is wet before tearing anything apart. Being that its a 2011 I wonder what the odds are of finding the matching wallpaper? I would really like to replace it with the same if possible.