If it's leaking from one of the metal "plugs" on the top of the pipe then it's a pretty common problem. They rust from the inside out. I have heard of repairs from welding it up to using JB Weld.
Never have heard any down side to the JB Weld but if you go that route I'd keep an eye on it.
Doug
Never have heard any down side to the JB Weld but if you go that route I'd keep an eye on it.
Doug