As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NON-COMMANDED CHANGE OF FLIGHT DIRECTOR PASSING FL170 IN DESCENT TO FL120, NOTICED CHANGE OF FLIGHT DIRECTOR MODE FROM NAV/VS TO NAV/ALTSCAP, GREEN, WITH A VARIATION OF PITCH FROM -2 DEGREES TO -8 DEGREES, VERTICAL SPEED GOING FROM -2500 FT/MIN TO -4500 FT/MIN, BEFORE FLIGHT CREW HAD TIME TO RESELECT MODE VS TO CONTINUE DESCENT TO FL120.