You may or may not have both the leveler and slide hyd actuator leaking internally... there is a simple procedure to test the levelers out that won’t require dropping the colorplast...
https://www.lci1.com/images/support/lipsheet/0076.pdf
Also before doing the above tests I would reccomend you due a bleed on the system... it’s very simple to do and you may have some air in the system...
Also by doing the bleed test first you will exercise the seals as well as open and close the actuator solenoid valves mounted on the manifold. A tad of garbage could have gotten into the system causing the slide out solenoid valve to slightly stick...
https://www.lci1.com/assets/content/...Pump_Units.pdf
To me the bleed is worth a try before doing anything else..