I have a Hunter sprinkler system with 4 stations, but I cannot get station #2 to turn off. I have cleaned the valves, rewired, disconnected the wiring at the valve/solenoid, restarted the system at the control box, and still I can't get it to turn off. I am out of ideas. I read that the spring in the valve may not be pushing into the diaphram to turn the station off, but have not yet tried this. Any other ideas that may help?