I figured after 10.5 years that it might be time to replace the dispenser hoses because I was noticing black stuff in the dispenser trays. I replaced two or the four hoses and clamps on the far left side and for good measure the hot water inlet valve. The inlet valve was okay but the screen had all kinds of crap in there that I couldn't clean out so now I have an extra solenoid just in case one of the others fails. While I was at it I removed the dispenser and cleaned the calcium build up on the outside and replace both the water inlet hoses with steel braided. Tip: I used some food grade lubricant sealant from my kegging stuff on the hoses ends and washers to help with sealing.