As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, EXPERIENCED A BURST OF SMOKE COMING FROM THE PACKS AND INTO THE COCKPIT AND CABIN. THE SMOKE SUBSIDED AFTER TURNING OFF THE RECIRC AND GASPER FANS. AFTER DEPLANING THE PASSENGERS, TRIED TURNING ON THE FANS AND THE SMOKE STARTED AGAIN. REPLACED LEFT RECIRC FAN. OPS CHECK GOOD. NO SMOKE NOTED.