As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON BASE TO FINAL AND INCREASING THRUST FROM IDLE, CREW REPORTED SMOKE POURED FROM VENTS FOR ABOUT 3 TO 5 SECONDS. CREW LANDED WITHOUT INCIDENT. LEFT PACK WENT FULL HOT AND AUTO FAIL AT GATE. MAINTENANCE PERFORMED HIGH POWER ENGINE RUNS IAW AMM. NO DEFECTS NOTED OTHER THAN LEFT PACK AUTO FAIL. MAINTENANCE TROUBLESHOT, R & R LT PACK TEMPERATURE CONTROL VALVE AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.