We have a 2012 34 STRE and have noticed some blistering on the interior wall below the emergency window leading to the bed room. The dealer tried to reseal the window but has not remied the problem. There are no "drip " marks around the window. The area is above the propane outlet, is it possible for it to be the heat? If anyone has any suggestions of what would cause the blistering and how to fix it , we would love to hear . Thank You