It sounds like possibly a solenoid is by-passing pressure.
Do all the other hydraulic systems work OK?
You can call or text Paul Maddox at 1-602-549-3638. He works for HWH and has offered to help anyone that needs it.
You can also email him at email@example.com
He has helped me in the past. Great guy.
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!