As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. MIA-GYE FLIGHT RETURNED TO MIA ACCOUNT AIRFLOW EXCESSIVE AND CABIN TEMPERATURE STUCK ON FULL COLD. OVERWEIGHT LANDING UNEVENTFUL. REMOVED AND REPLACED LEFT ENGINE BLEED AIR REGULATOR PER AMM 36-11-03 (AALA20171201001) AND LEFT ENGINE PRESSURE REGULATOR AND SHUTOFF VALVE PER AMM 36-11-04. OPERATIONAL CHECK GOOD.