EVERYTHING listed above to try to fix this issue DID NOT work for the LCI level up system on my 2016 DRV 36RSSB3. We tried ALL THE ABOVE. Took it to be worked on under warranty repair. They used fork oil to see if that helped. They replaced the valves, replaced the pump, replaced the door side front Ram.. Did every trick that was stated above and more. I was told by Ron McCoy, who was on the ground floor of the manufacture of the level up system. The DRV IS IS A HEAVY UNIT! With heavy pin weight; mine is 4125#. He stated that the front rams on DRV aren’t robust enough. That’s why they’re encased inside a steel tube.. to keep them from BENDING!!. He stated when rams and possibly slides start acting up... and I had 3 rams and a slide I had to fix up just to tow my 5er! He replaced BOTH front RAMS, ( that’s the recommendation), with two 8K each Rams. It’s THE ONLY THING THAT FIXED MINE AS WELL AS QUITE A FEW OTHERS.. THE ONLY THING.. everything else was tried and nothing fixed the issue. Mine was fixed under warranty. It’s MUCH more robust and in over 3000 miles of towing and fulltiming, zero issues since two front rams were replaced. It wasn’t the valves , poppets, pump, hydraulics, adding fork oil or anything stated above.. and believe me it was all tried by so called RV repair technicians.
Been there, done that, lived it and actually know what it takes to fix it. Go to a DRV SITE AND CHECK IT OUT. I’m talking heavy pin WEIGHT on an already heavy DRV.. Don’t know about other 5ers but became quite learned on the DRV. I was also an Engineer and spent about 14 years dealing with hydraulics at one job in my career .
Jim