This appears in Part-ML and specifically I wonder if it applies to autopilots or autopilot servos.

If you are technical competent, you know what to do.
Technical competent, means, that you know the design and you are able to judge the failure modes, as well as the condition.
Missing competence calls for delegation of the responsibility and the judgment to a regulation.
Personal I propose NEVER to regulate such details, th ends in hughe dicuments, which are not assiting the technicians, but the lawyers if something happens.
Study the technical information instead of.

Use all effort, that it never happened

That really was not a very helpful comment.

Hi Peter,
Could you please give a refrence of Part-ML? Frankly speaking I have not found this phrase there!
Thanks in advance,

Hi Peter,
1. Life-limited means that it has an airworthiness limitation (e.g. hours, calendar or cycles) as set per approved maintenance data (e.g. maintenance manual) or ADs. This would be the case for most engine components, for example.
2. Part of the primary structure means a load-bearing element, in the sense that a removed or damaged component would decrease the "strength", hence safety, of the aircraft. This typically means any part of the structure of the airframe, including the skin.
3. Flight controls mean the collection of mechanical parts, such as rods, cables, pulleys, and sometimes chains to transmit the forces of the flight deck controls to the control surfaces. The controls and the surfaces, being primary (elevator, ailerons, rudder) or secondary (flaps, spoilers, trim tabs) are also included here.
A more EASA like description can be found here: https://www.easa.europa.eu/sites/default/files/dfu/certification-docs-c…

This suggests autopilot servos are NOT a part of the flight controls.