I have the same autopilot
and had a problem which I believe is a problem mabe related to others . The computer control circuit for the hyd solenoid is undersized . In my case I had a jumper wire soldered in where the circuit burned , next when that is repaired you use that circuit
as a trigger for a relay
to direct power to the solenoid
to open or close hyd valve. The amperes needed to trigger the relay is less than the amperes to operate the solenoid so that way the computer controls less direct current
and won't burn out again.
The circuit design is way to small to support the load of the solenoid but good enough for the relay draw so open the computer black box and inspect circuits for burned circuits. I hope this is your answer to your problem .
S/V Free Spirit
Long Island Sound
Stratford , Ct