As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDANT REPORTED A STRONG SMELL SHORTLY AFTER LANDING. ITS ORIGIN WAS THE AIR VENT OVER SEAT 23C AND REPORTEDLY SMOKE CAME FROM VENT TWICE DURING TAXI IN. MAINTENANCE INSPECTED THE PSU AND VENTS ABOVE CEILING PANELS AT 23C WITH NO DEFECTS NOTED. OPERATED BOTH ENGINES AND APU WITH BOTH PACK ON - NO DEFECTS.