As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STL - FLIGHT 4038 THE CREW REPORTED SMOKE IN THE COCKPIT AND CABIN WITH POSSIBLE PACK FAILURE WITH NO EICAS MESSAGE. THE AIRCRAFT DIVERTED TO STL WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 1 ACM, OPERATIONALLY TESTED WITH NO DEFECTS AND THE AIRCRAFT WAS APPROVED FOR SERVICE ON 07/15/2018.