You have to get a repair kit and install new seats,springs,diaphrams,and screens,you can try to just clean old ones up and lube with plumbers grease or vaseline and make sure that all the screens are flushed out good that may take care of problem(I recommend repair kit!).
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You have to get a repair kit and install new seats,springs,diaphrams,and screens,you can try to just clean old ones up and lube with plumbers grease or vaseline and make sure that all the screens are flushed out good that may take care of problem(I recommend repair kit!).