Blaine
What manufacturer made your leveling system
RVA ,HWH,
check at your hydraulic valve block to make sure the manual dump valves are all closed and look carefully for any signs of hydraulic leaks on the hose headed to that from jack and on the jack ram itself.
There should be two solenoid valves for each jack these valves have an electric coil on them which is held in place with a nut
Once the coil is removed the valve can be screwed out of the valve body (only do this with all the jacks retracted)
With the valve removed check the O rings on both valves for damage ( possible leak by) if not damage move one valve at a time to another jack control spot on the manifold to see if the leak down follows that valve ie if you move the retract valve from the front jack position on the manifold to the right rear position and the leak down now is in the right rear you have identified the faulty valve.
Hope this helps
Eric
