I know this issue has been beat to death and most people probably know whether they have it or not...But, I found that I too was one of the unfortunate individuals that had the crushed duct. I printed out a discussion from this forum and brought it into the dealer. Told them that I spoke with Keystone and they (Keystone) was aware of this issue. Well, they repaired it similar to how it was posted on this forum, however, (Finally getting to the point) look at the underside after the work has been completed. They cut the corrugated underbelly then used duct tape to put it back together. I was not happt when I saw that, went back into the service department and stated that the reason for "warrantee" work was to return the vehicle to a better condition, they repaired one item and created another item. After some emotional convictional discussion, they agreed to replace it. In fact, they are going to install the membrane type that is typically installed on the underside of the Montana line. Just thought this may have been worth mentioning. If anyone else out there has work done that may require the removal of the underside, watch to see that they do not cut it.