As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 3630 - THE CREW REPORTED SMOKE IN THE COCKPIT AND CABIN. THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE REMOVED AND REPLACED THE PACK COOLING FAN IAW ATR42-500 MM 21-33-21, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)