I have a ‘18 Cedar Creek 34rl2, Lipert leveling jacks left rear jack leaks down the shaft. I have a puddle of oil on the ground under the foot of 12-14 in in dia. after standing 3 weeks, called around...
I have not done it, but there have been people that took the leg off and took it to a hydraulic repair facility... They rebuilt ( replace O-Rings & seals) them cheap... cheaper than buying new