As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX REPORTED COLD AIR COMING FROM VENTS. AFTER LANDING 2 PAXS SITTING BEHIND THE EXIT ROWS REPORTED SMOKE COMING FROM THE LOWER VENTS. PAX DID NOT REPORT SMOKE TILL AFTER DEPLANED. GND RUN BOTH ENGS, BLEED AIR & CABIN TEMP CONTROL. OPERATIONS CHECKED GOOD, NO DEFECTS NOTED & NO SMOKE NOTED. OK FOR CONTINUED SERVICE.