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Greetings,
You're in the right state!
Get ahold of Ron Hitchcock at Executive Autopilots in Sacramento. The number is 916-399-5969. Tell them that Bridgette sent you.
Usually, they like to see the entire airplane for a test flight. They look at:
Control Cable tension
Pully lubrication
Autopilot Computer functioning (they usually have a spare for the flight)
Cable connections
and a lot of other things are on their troubleshooting checklist.
Ron will also give you the straight scoop on if it is better to repair or replace the 400A. I observed Ron turn down a planned 55X installation in favor of repairing a 400B in a T210 recently. The 400B problem was a dying computer. Remove, replace, tweak, and the autopilot and aircraft owner have been happy since.
Good luck and let us know how it goes.
Fly SAFE!
Jedi Nein
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