I came back to check on a valve that we might have worked on. We replaced the valve for zone 5 during our original visit. The valve in question today was the valve for zone 6, so this was not a warranty. The issue was the bleed screw on the valve was opened enough to let a very small amount of water out filling the valve box, but not opened enough for the valve to open. I tightened the bleed screw, and stopped the leak. I charged for the return visit due to this not being a warranty.