@Safety Concerns:
I had earlier wondered the same thing when deciphering the ACARS messages and had been told (by an amused old fellow) and posted my answer earlier: An autopilot being switched off in the cockpit is nothing the Airbus CMS (Boeing acronym, sorry) will report home about.
To make it even clearer, logging and reporting to home base are two different functions and I have been told the choices of maintenance data sent can be airline-specific customizations.