As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI IN, CREW REPORTED CAPTAIN-SIDE FAN MAKING LOUD NOISE. CREW ALSO REPORTED LEFT PACK AUTO FAIL MESSAGE AND THAT THE COCKPIT FILLED WITH SMOKE AFTER PULLING INTO GATE. PASSENGERS WERE UNLOADED IN A NORMAL FASHION AT GATE. MAINTENANCE INSPECTED AND FOUND SMOKE TO BE FROM LEFT PACK. MAINTENANCE REMOVED AND REPLACED LEFT AIR CYCLE MACHINE AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.