As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT FLIGHT ATTENDANT ADVISED CREW OF ODOR OF SMOKE IN CABIN. PAX COMPLAINED OF THERE FEET FELT HOT ON THE FLOOR. A/C RETURN TO GATE. OTHER PAX CONFIRMED ODOR OF SMOKE. INSPECTED BLEED AIR SYSTEM NO DEFECT NOTED. REMOVE FLOOR PANEL TO INSPECT THE RECIRCULATION FAN. FAN WAS INOP. MEL RECIRCULATION FAN. REMOVED AND REPLACED RECIRCULATION FAN. AIRCRAFT RETURNED TO SERVICE.