Very odd. Was turning yellow in many spots. No way it could have been something I did as it was even on the carpet that was under the front seat brackets. Got a whole new carpet installed today under warantee. The only guess I have is maybe the dealer used something before I got the truck as it started not long after I got it and got progressively worse. Would not explain how it got under the seat brackets though..........

 

I have an 05 with the tan interior and it still looks great. I hope this is not a problem I will have as I am out of warranty.