HWH leveling

I had the problem on my 2003. The HWH manual has some pretty good ideas for troubleshooting. I tried calling the tech line but they were only taking messages and calling back (which they did in 3 days). I went to the jacks in question and cracked the hydraulic line to see if the jack would then go up. If it did I figured it was in the solenoids or such in the controls. Mine did not go up, it stayed about 2-3 inches down. I even took a 2 x 4 and tried to lever the jack up to see if the springs were weak. Wouldn't move. So I took it off and brought to a hydraulic shop who disassembled it and found a snap ring out of place inside the unit. Took him literally 3 minutes to fix. No charge. Put it back on and voila works great now. Mine was only one jack but the opening the line trick should work on any number.