As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE LEFT PACK LIGHT ILLUMINATED - RAN CHECKLIST COULD NOT GET PACK LIGHT TO EXTINGUISH - CONTINUE FLIGHT WITH ISOLATION VALVE IN THE CLOSED POSITION. GROUNDED - YES. REMOVED AND REPLACED RAM AIR INLET ACTUATOR REF BOEING 737-900 AMM TASK 21-51-21-000/400-801.