LCI levelors are a power down and a power up jack system. The fact that 1 extends with no power points to a leaking solenoid at the Pump assbly. It is a INTERNAL leak, not leaking on the ground. You go to the solenoid for that jack and make sure the manual release is set in normal position. But, if you have done nothing to the jack system at all and this came up, then the odds are you have a defective solenoid. Doug