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I had all the radiators on the first and 2nd floor of a 3 family replaced recently. Initially the plumbers had a difficult time adjusting the valve so that steam wouldn’t shoot out. Water started stream out as well and the boiler would shut down. A “steam specialist” was brought in and determined that return pipes were very clogged and needed replacing. They suggested replacing the back return(where the pimary problem was) for $600 or we could do the whole run-front and back for $1800. We chose to do just the back and once in there they decided that the whole thing didn’t absolutely need to be replaced and charged $400. It stopped leaking and didn’t make noise for about two weeks. Last night it sounded as if a wave machine dropped into the bedroom -no leaks but lots of wooshing noise. Should I have the rest of the return replaced-including the front for $1200 or am I wasting my money with plumbers who don’t know what they are doing? Thanks for your suggestions.