Was doing some cleaning on my 2015 Hyper Lite XLR 27HFS Toy Hauler today. Went up on roof to wash it and noticed one of the seems under the rubber membrane has seemed to "pop" in a 8" section of what I think is a plywood seam. I can easily push down the section to match back up but it pops right back up. No water damage inside of the trailer anywhere on the ceiling. roof looks perfect around the location so I'm not sure what's happening. I have had the unit about 18 months, purchased new last year. Anybody know if this is a warrant/ construction issue? How about repair? I have attached a picture sorry for the crappy quality .