AMF:
It's a assumption to believe the autopilot did so as a result of equipment malfunction, and it was the first recorded ACARS message. If AP parameters (say, pitch, roll, trim limits due to altitude hold, etc) were exceeded and it thus disengaged, what were the forces acting on the aircraft that caused those exceedences?
"first recorded ACARS"... no, they are unsorted and should be sorted in order of priority, plenty are triggered at the same time.
AP & A/THR are kicked off because the aircraft go to ALERNATE LAW2 as a consequence of the unreliable AIR DATA, etc. No exceedences of forces acting on the aircraft are needed to do that, but it certainly won't help for crossing a [undetected?] tropical CB.
See above post, the ACARS are now published in their integrality.
S~
Olivier