[JRTJH]

Have you had anyone with a good, working knowledge of RV's look at it and give you any information on what they think is the cause? At this point, without an "expert's" opinion, anything anyone says is pretty much speculation. I'd try to get an opinion from an expert before raising a ruckus. You might find that Keystone is correct or you might find that it is glue/adhesive failure. Guessing won't give you much leverage, knowing what caused it will.