What was found
DURING A MASTER CAUTION CHECK, THE LT PACK LIGHT ILLUMINATED ON RECALL. ACFT GROUNDED. ACCOMPLISHED A LEFT PACK/ZONE TEMPERATURE CONTROLLER BITE TEST IAW 21-61-00-700-806-002. FOUND AN EXIT ACTUATOR FAULT LOGGED. ACCOMPLISHED A LEFT RAM AIR EXIT ACTUATOR FAULT ISOLATION IAW FIM 21-62 TASK 853. ABLE TO CLEAR FAULTS. WHILE PERFORMING AN A/C GROUND TEST, FOUND THE LEFT PACK LIGHT ILLUMINATED. AFTER DOING THE BITE AGAIN FOUND LEFT EXIT ACTUATOR FAULT RETURNED. DUE TO HISTORY, REMOVED AND REPLACED THE LEFT PACK EXHAUST AIR ACTUATOR IAW AMM 21-51-27. OPS CHECKED GOOD.