What was found
AIRCRAFT WAS GROUNDED: FROM TOP OF DECENT HAD ABRUPT ERRATIC STAB TRIM WHEEL MOVEMENT UP AND DOWN IT KICKED OFF BOTH AUTOPILOTS SEVERAL TIMES HAND FLEW AIRCRAFT STILL HAD ERRATIC STAB TRIM MOVEMENTS WHILE HAND FLYING. AIRCRAFT WAS CONTROLLABLE DURING TRIM WHEEL MOVEMENT BUT COULD FEEL PITCH CHANGES ABRUPTLY CHANGING UP AND DOWN. FIXED ITSELF AT 10,000. REPLACED ELEVATOR AILERON COMPUTER (ELAC) #1 AND ELEVATOR AILERON COMPUTER (ELAC) #2 (AALA202110273012) PER AMM 27-93-34. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 27-93-00.