A little bit of an intro: I bought an outboard center console from a good friend who had fished the boat hard, but then let it sit for 4 or 5 years without running. When I got the boat, the Seastar Helm would not turn in either direction. I assumed that the check valves where stuck open, so that pressure would be applied to both hydraulic lines at once making the steering "frozen". Due to a bit of a time crunch I bought a new helm unit, purged the lines and filled it up with fresh fluid. This worked well for me for the first year and a half. Last fall I started having issues with the steering not tracking strait, the engine would slip while the wheel remained still. I would have to turn the wheel to port constantly to fight the pull of the prop. I thought that the gaskets on my cylinder where the cause, so I replaced those and didn't have any improvement. Today I checked the system for any air in the lines, as well as discolored hydraulic fluid. The Fluid was air free, but there was some discoloration to the fluid. Anyone ever have a similar issue with these units? I'm thinking it must be a check valve in the helm again, that is not holding pressure against resistance. Has anyone rebuilt one of these units themselves? Seastar has not been of much help.