I had the same problem, talked to Lippert and they said it would cost me $5000 to fix by replacing the complete unit. This was there fix for the problem. So I decided to pull the cylinder out and have it checked by a hydraulic shop there was no problem there. Removed the solenoid for that slide and checked the oring which looked ok, had a company that could test the solenoid test it and low and behold the 5 cent oring was no good and leaking. Lipperts fix $5000, my fix and a little time 5 cents and a little gas. Hope this helps some of you.
