What was found
MCI - FLT 18713 - AILERON TRIM RAN AWAY FULL LEFT AND CIRCUIT BREAKER TRIPPED. RESET CIRCUIT BREAKER EMERGENCY/ABNORMAL CHECK LIST FOLLOWED BY CREW. APPROACH AND LANDING WERE NORMAL, AIRCRAFT WAS CONTROLLABLE. CORRECTIVE ACTION: THE TRIM SYSTEM WAS ACTUATED NUMEROUS TIMES WITHOUT REPEAT OF THE FAILURE IN THE TRIM SYSTEM. REMOVED AND REPLACED TRIM CONTROL BOX, AS A PRECAUTION, AND PERFORMED COMPLETE OPS CHECK IAW FALCON MM 27-10-00. OPS CHECK NORMAL. NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE. (X)