As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A NR 2 PACK OVERLOAD MESSAGE WITH A BURNING ODOR. LANDED WITHOUT INCIDENT AND MAINTENANCE REMOVED AND REPLACED THE NR 2 ACM, OPERATIONALLY TESTED WITH NO DEFECTS NOTED, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.