One thing to consider: If you admit to so much as looking at the truss rod the wrong way, let alone if there are grinding/scraping marks on the truss rod adjuster, GC will tell you to go pound sand. "Oh so....you got the bass home and attempted to adjust the truss rod with needle nose vise grips huh? Now it's stripped and you wanna return it? Take your bass and get out before I have you thrown out." <--I can see/hear it now!
Good luck!
Good luck!