Even though I own a GXP, I have detailed a few Sky's and it appears your cars have the saggy seat issue also, I got mine repaired under warrenty, so if you have this problem, you have can get help from your dealer, hope this helps some people out............
My dealer never disagreed with me about the saggy seat issue, and he said he would repair it under warrenty and he made good on his word, here is the info so others might benefit. First of all he didn't do the repair at the dealship, he had it done at an interior shop that does nothing but interior work, When I was talking to the guy at that shop, he told me some things if importance. The foam backing used in our cars is called "desinagrating foam" in other words eventually you will be sitting on nothing other than your springs. He had to take into consideration my height (6' 4") before he made the repair, too much foam would have me sit 2 or more inches higher, in my case that would be a diaster, he what he did was remove the seat and leather cover, he re enforced the area on top of the springs, and then used a high quality foam that he said would out last the car. He used just enough so I don't sit up to much higher, I do sit a little higher because I'm not sinking way down into the seat now, its a firmer feel, but I like it alot, he was careful not to tighter the leather or use too much foam, as you can see in the after pic it still has a little give there, however its a 99% improvement, and the best part it cost me nothing. Hope everyone has luck with their dealership on this issue, mine is driven by customer service. Good Luck!!!Oh, and he gave me a loaner car to boot!!!! Gary
