Sounds like you got lucky if the valve is the only problem. Only thing I can suggest is to pull the valve and see what happened. Could be as simple as a new gasket. There is a big O-ring that may need replacing. The clamp band has to be on pretty tight. I snug mine up every spring when I put it back after winter and of course it will leak, then keep tightening until the leak stops. But, I would check that O-ring first. If the body is cracked you should probably just get a new valve but trying to seal it from the inside with JB Weld may work too. Can't lose anything by trying.
Al