How could it possibly be a short in the connectors? All that would do is melt wires, NOT the servo case or motor. Johnny, I think that somehow the receiver is somehow commanding the servos beyond their end-points, as Kevin pointed out. Sounds like you have already eliminated binding (heck, one failed not even connected to the valve, right?). Therefore the receiver has somehow failed and caused erroneous pulse width commands or your transmitter is commanding higher or lower than normal servo positions.