Hynautics Hydraulic pump problems

[mcmichaelmcmahon]

Hi
We took out our 42 Whitby yesterday and the helm kept pulling hard to the right. If you let the helm go the boat would circle completely. I assume we have some kind of failure in our Hynautics pump. Can anyone help me troubleshoot the problem? I can't hear any air circulating in the pump. I tried to bleed it and there doesn't appear to be or have been any loss of fluid.
Look forward to your responses
Mike