As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING FROM MIA STATION AND DURING THE CLIMB, AIRCRAFT N336QT EXPERIENCED SMOKE ON THE LEFT SIDE OF THE COCKPIT, ACCOMPANIED BY THE 'AIR PACK 1 REGUL FAULT' INDICATION. THE CREW IMMEDIATELY DECIDED TO RETURN TO MIA STATION. DURING THE MAINTENANCE INSPECTION AT MIA STATION, IT WAS FOUND THAT THE PACK 1 AIR CYCLE MACHINE WAS DAMAGED (BROKEN). THE UNIT WAS REMOVED AND REPLACED. THE TESTS WERE SATISFACTORY. REF: AIRBUS TSM 05-50-810-829-A, AMM 21-52-21-000/400-801-A.