AutoPilot Pump not steering port (but can hear it trying)

Pop

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Hi all,
I tried my autopilot for the first time this weekend and it failed. I spent time with the Raymarine tech on the phone today. After some extensive debug, we ended up putting 12volts directly to the pump and my outboard moves starboard but not port.
As always help is appreciated
Thank you
Steve

A couple of questions:
  1. I want to remove the M81120 type 1 hydraulic pump, how do I keep the hydraulic fluid from draining? Is there any tricks?
  2. Has anyone every seen this issue? Is there a way to get the pump un seized?
  3. Is there a schematic / diagram of the pump workings?
  4. Any other ideas welcome
 
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