Wife and I went out to the TT to sanitize the fresh water tank today. When I was closing up when the job was complete, I noticed something strange on the wallpaper between the entry door and the bedroom door. From floor to ceiling, the wallpaper is "blistered" in a weird way. It almost looks like there is a large grain of sand under each "blister", or "pimple", but I can press the raised area back down to the plywood beneath and there is nothing behind the wallpaper but air. I can find no signs of water infiltration, no discoloration, and I can't remember any water ever getting sprayed on that particular wall.
Here's a few pics,...any ideas? (Yes, I have checked the roof for leaks and cannot find any suspicious areas)
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