I had a slow leak in one of the reproduction bias plies on my Belvedere. I took the wheel off and called Wheel Works because we have had decent service there in the past with my truck and my wife's Honda. I ask the guy if the can fix a slow leak in a bias ply and he immediately goes on the offensive, putting on his lawyer hat. He asks, "How old is the tire?", probably thinking it was from the 60s or 70s. I told him it's a reproduction bias ply from 2017. He says he can't do anything with it and that nobody will touch an old tire. I told him it's only 6 years old. He did end up referring me to a tire place that was not too far away. I called them, they said "Sure, come on down. No appointment needed." I get there and a guy greets me before I even get out of the truck. He takes the tire and puts it in their tub of water. The valve stem was the culprit. He swaps the valve stem, charges $25 and I'm down the road.