It's been a few years but Napa actually had the water valve sealing diaphragm in a kit to service the unit but as usual I had to do all the homework and provide the number of the kit..The valve's actuation pin sealing diaphragm gets old and brittle then leaks...The biggest concern there is the parts corroding and not being serviceable for the sealing duties...It was a poor design no doubt but hey, it is what it is for those years...