I just bought a 2002 Yukon SLT with the 50/50 third row seats. After pulling them out to clean them I reinstalled them and noticed the passenger side seatbelt had a little slack. I pulled it and there was no resistance nor spring back. Has anyone encountered this and if so what did you do? I have dealt with this on other seat belts just not with self contained in seat seat belts. Any help would be greatly appreciated.