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Performed repairs as per previous diagnosis. Replace 1/2 pressure reducing valve and back flow preventer. Also replaced 3/4 pressure relief valve . Found expansion tank did not have any holes in tank and did Not need replaced , so properly drained down expansion tank , and boiler piping system. After replacing the components, re filled boiler and purged out air. Both first and second floor piping is getting hot again and told homeowner some air will still be left in the system and will work its way out of the air bleeder. After replacing and boiler was hot, checked boiler pressure it was 15 psi during a run cycle.