[Trines STS]

My 01 STS has a wet wheel well The only way it,s noticed is by Removeing the spare and feeling the insulation under the mat thourgh the hole in the mat where the hold down stud is. When I first found this problem the tire was even wet, really wet. It,s still under warranty so took to the dealer for repair, they cemented the trunk seal,dried it out and thought that would take care of it,now after two months it,s getting wet again. So back to the dealer. Has anyone else had this problem?,maybe you should check yours! Please respond. Thank you Trines STS