As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED SMOKE IN THE COCKPIT AFTER PACK ONE WAS USED. THE AIRCRAFT LANDED WITHOUT INCIDENT WHERE MAINTENANCE PLACED THE NR 1 PACK ON MEL 21-51-00-1 AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE, OPERATIONALLY TESTED WITH NO DEFECTS NOTED AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.