As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DECLARED. FLIGHT RETURNED TO DEPARTURE DUE TO A LEFT AIR CONDITIONING PACK WARNING INDICATION. LANDING UNEVENTFUL. REMOVED AND REPLACED LEFT CABIN AIR COMPRESSOR INLET DEFLECTOR DOOR ACTUATOR IAW AMM DMC-B787-A-21-51-16-00A. OPERATIONAL CHECKED GOOD. AIRCRAFT WAS GROUNDED.