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My experience has been (and I think that if you do a Search you will find that others agree) that the 400A is a fine autopilot. It is, however, subject to aging, in the sense that with time (35 years for a 1973 model) the electronic components drift/atrophy and service is required. The most common fault is leaking capacitors, which is an easy repair. You can still find shops that fix them, and the equipment can be removed (1/2 is under the throttle/props/mixture levers, the other half is overhead and towards the rear, behind the headliner) and sent out to be serviced.
On this subject, perhaps the most knowledgeable person on this Board is Pete Somers and I hope he'll jump in here with his views. BTW, my Search on autopilot and 400A yielded many threads with good info.
Ernie
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