As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING TAXI OUT FOR FLIGHT 3814, THE CREW REPORTED SMELLING SMOKE IN THE CABIN. THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE REMOVED AND REPLACED THE EXTRACTION FAN IAW ATR42-500 JIC 21-23-21 AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)