2010 Heartland Sundance 297 XLT RE. Wearrived at our favorite rv park yesterday and when we extended the left rear slide heard a loud pop and now we can seen light coming through between the floor and side of the slide. Covered the space with duct tape as it's pretty cold here. Have already contacted extended warranty provider and auto insurance provider. Both said manufacturer defect, not covered. Waiting for a response from Hearland but not sure they will be willing to help as we are beyond the year warranty. Had an independant repair person look at it and he said whole slide has to be removed and floor rebuilt, as it was assembled using dry wall screws which have "pulled through" the floor material. We love our trailer and are now fearful of rip-off repairs. Anyone with experience in this type of problem we would appreciate input.