Hi, The problem began with zone 2 not watering to capacity. Not knowing anything about the valve, I adjusted the bleed screw, which bumped the flow up to capacity (I don't know why but it did). This wasn't a fix though as I noticed the grass starting to brown. I pulled the valve apart and checked the diaphram. It looks good, no holes or tears. Now, the valve won't turn off regardless of what zone I'm running. I've disconnected the wire at the controller and the zone still runs. I've checked the ...