As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REPLACEMENT OF RIGHT PACK RAM AIR ACTUATOR ON DEFECT 60478284, FOUND RAM AIR ACTUATOR FAULT ON LEFT PACK/ZONE TEMPERATURE CONTROLLER. VERIFY TEST CONFIRMED LEFT PACK RAM AIR ACTUATOR FAULT. GROUNDED - YES. REMOVED AND REPLACED LH RAM AIR INLET ACTUATOR REF B737-800 AMM 21-51-21. OPS CHECK GOOD.