As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK AMBER LIGHT ILLUMINATED ON APPROACH INTO SEATTLE. QRH RUN. LIGHT EXTINGUISHED. PACK LIGHT ILLUMINATED AGAIN ON LANDING. RESET ON TAXI IN. ACFT GROUNDED, BITE TEST OF LT PACK/ZONE TEMP CONTROLLER, M1442, FAULTS RAM AIR INLET ACTUATOR. REPLACED LT RAM AIR INLET ACTUATOR. INSTALLATION TEST PASSES AND BITE TEST OF PACK/ZONE TEMP CONTROLLER, OK REF AMM 21-51-21-400-801.