As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ON 2 OCCASIONS ONCE CLIMBING THROUGH 31500 THE OTHER AT 33000 WITH AUTOPILOT1 ENGAGED, AIRCRAFT ABRUPTLY LOWERED PITCHED AND STARTED A DESCENT. AUTOPILOT STAYED ON SYSTEMS MESSAGE BOX APPEARED AND CAT 3 DUAL INOPERATIVE. ALSO SAT AND ISA TEMPERATURES ON LOWER ECAM SHOWED 8 TO 13 DEGREES WARMER THAN THE FLIGHT PLAN FORECAST ALL FLIGHT. **SUPPLEMENTAL INFORMATION: REMOVED AND REPLACED AIR DATA AND INTERNAL REFERENCE UNIT 1 IAW AMM 34-12-34.