What was found
LT PACK LIGHT ILLUMINATED ON CLIMB. RESET W/MASTER CAUTION. SUBSEQUENTLY ILLUMINATES ON RECALL, EXTINGUISHES WITH MASTER CAUTION. GROUNDED-YES. PERFORMED PACK TEMP CONTROL BITE, REF B737-800 FIM 21-62 TASK 801. FOUND NR 1 ZONE TEMP CONTROLLER FAULT "RAM AIR ACT". PERFORMED FIM 21-62 TASK 837 TO STEP F. REMOVED AND REPLACED LEFT PACK RAM AIR INLET ACTUATOR, REF B737-800 AMM 21-51-21. PERFORMED BITE TASK AMM 21-61-00. SYSTEM OPERATIONS CHECK GOOD AND NO DEFECTS NOTED.