While winterizing our 2015 Columbus 320 last fall I noticed about a 4 inch bubble in the fiberglass to the bottom right of the bedroom slide. It is not soft. In fact, the dealer and I both pushed on it and it is very hard. The dealer and two of the techs watched the bubble to see if it would change shape or size while I opened and closed the slide. Both of them said it did not change. Since I was putting it away, and under time constraints, I was not able to leave it at the dealer. I am to bring it in this spring when I get it out of storage. The dealer did tell me they not to be to hopeful on getting any help from Forest River for repairs. Really? $45 grand for a rig less than two years old, with extended warranty, and don't expect any help on repairs? My words to the dealer were not printable here. I will try to post later this spring when I find out what happens.