Two helms + autopilot
+ two rudders, fluid-linked without a tie rod = awkward system to troubleshoot.
Periodic adjustment of rudder alignment in their fluid-linked system is "normal and takes only seconds" according to HyDrive but I saw no time frame mentioned in anything I read. 3 hours would point to leaky rudder ram seals
I did notice some wetness around the unions on the unknown device in your first photo
- if there are impossible-to-reach joints they need checking too.
A hand pump, gauge and enough of the right adapters/blanking plugs helps to diagnose unfamiliar hydraulic systems. A system plan of the steering from your builder
would be a big help too.
Sorry my geriatric rambling won't be much use to you - my experience was mostly limited to Hiab/Atlas type loading cranes and other big stuff.
For the prices of these big cats I'd have expected auto rudder alignment. And a butler, a maid and a gardener