As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN AUTOPILOT ONE, AIRCRAFT STARTED AN UNCOMMANDED CLIMB AT CRUISE. AUTOPILOT 2 WAS OK. POST FLIGHT REPORT SHOWED ADIRU1 FAULTED. BITE TEST AND GROUND SCAN OF ADIRU 1 CHECKED GOOD IAW AIRBUS MAINTENANCE MANUAL 34-13-00. PERFORMED AUTOMATIC FLIGHT SYSTEM TEST WITH NO FAULTS NOTED IAW MM 22-96-00.