I hate to be the bearer of bad news but it may have to be replaced. There are two diaphragms in a two stage regulator, which is probably what you have. Once a diapragm is blown you have to replace it. I would suggest contacting the manufacturer and finding out if they sell the replacement part and then decide if you want or can replace it yourself. I am not even sure if it is an option but all you can do is find out.