by Steve and Michelle 2003 U320
Ours developed a leak through. Symptoms were water pump short cycling when no water was being called for and no leaks. Closing the manual flow control on the fill valve stopped the cycling. CSI ForeForums to be conducted on the old valve to see if it can be repaired/rebuilt to carry as a spare (new ones are over $200)
Old Valve
Unplugged
Valve Removed
Valve Assembled
Plug in