Back on March 23rd, I posted about the water pump in our 3400RL sounding like a jackhammer/rock crusher in the basement. I am happy to say that after installing a Shur-flo pressure tank, the noise has virtually gone away. From a rock crusher to a purring kitten is about what it amounted to. I may have inadvertently corrected some hose contact points too, but nothing that was obvious. I DID however, find some loose ductwork fittings on the furnace, and some loose electric (12 volt) connections while I was in the "basement", so it pays to look around while you have the cover off. Otherwise, it sounds good.