I have a control valve stuck on so I have to turn off the main water feed. It is a Weathermatic valve and is about 6-7 years old. I've taken the top half out several times. The solenoid appears to be working - it pulls the plunger up when energized. But I would not suspect a solenoid problem if it is stuck open. The manual control is in the "off" or "automatic" position. And the electrical leads are currently disconnected. I can't figure out the mechanics of the valve so I can't determine what's...