As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLIGHT 3999 THE CREW REPORTED SMOKE IN THE COCKPIT. THE AIRCRAFT DIVERTED TO DFW WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE PLANE AND PLACED THE NUMBER ONE PACK ON MEL 21-51-00-2, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. ON 12/02/18 IAH MAINTENANCE REMOVED AND REPLACED THE NUMBER ONE ACM, OPERATIONALLY TESTED WITH NO DEFECTS, REMOVED THE MEL AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.