In my case, Teleflex replaced the helm unit over the weekend. The boat was only a few weeks old, and Marc at Wefings sent his tech up with the power bleeder and installed and bled the new system. I have not had any problems sense. However, I have not backed down really hard since.
When my helm leaked it was massive amounts of fluid--mostly from the rear seals. I had backed down moderately hard, but not harder than I have in many other boats.
I wonder if this characteristics is related to the "liquid tie bar" system. I suspect that because of this connection--there are no check valves betweent he two cylinders--as there might be in other type of systems.