What was found
PACK LIGHT ILLUMINATED ON MASTER RECALL. GROUNDED - YES. PERFORMED #1 PACK ZONE TEMP CONT BITE REF B737-800 AMM 21-61-00. FOUND RAM AIR INLET ACTUATOR FAULT, L/H PACK RAM AIR DOOR STUCK CLOSED. REMOVED DOOR ARM BOLT/DISCONNECTING ARM FROM ACTUATOR AND POWERED ACTUATOR. ACTUATOR BUZZED LOUDLY AND OVERHEATS, STUCK IN EXTEND POSITION, TAPPED ON ACTUATOR AND IT DROVE TO RETRACT POSITION. REMOVED AND REPLACED L/H RAM AIR INLET DOOR ACTUATOR REF AMM 21-51-21. CHECKED FOR SMOOTH OPERATION OF L/H RAM AIR AND DEFLECTOR DOOR MECHANISM WHILE ACTUATOR REMOVED. NO DEFECTS NOTED. #1 PZTC BITE NO FAULTS. RAM AIR DOOR OPERATES NORMALLY. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL. ALL TESTS PASS. AIRCRAFT RELEASED FROM MEL 21-32B.