As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW HAD A REPORT OF LEFT 14TH STAGE DUCT WARNING MESSAGE. RAN THE QRH, THE MESSAGE WENT AWAY AND REAPPEARED. CREW DECLARED AN EMERGENCY, DIVERTED, AND LANDED WITHOUT INCIDENT. MAINTENANCE COMPLIED WITH OPS CHECK OF THE BLEED AIR LEAK DETECTION AND WARNING SYSTEM AND THE BLEED AIR LEAK SYSTEM OPERATIONAL CHECKED GOOD.