I am looking at purchasing a used Lacrosse. I test drove a 2015 Lacrosse Premium today. It has the sunroof in it. The headliner at the front of the sunroof and the driver's side is sagging about an inch. You can pull the headliner down and look between it and the metal roof of the car. The salesperson contacted their service dept. who said this is a known issue (they said they warp) and that nothing can be done to repair it, so essentially it will just hang down an inch. It looks terrible. They said it's just asthetics, and that the sunroof functions properly. This is a certified pre-own by the way. That does not sound right to me, but curious if any owners have experienced issues like this with the headliner?