As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED TO MSY DUE TO INFLT SHUTDOWN OF NR 1 ENGINE, WHEN OIL PRESSURE DROPPED BELOW RED LINE, DUE TO CSD CARBON SEAL LEAKING. LANDED WITHOUT INCIDENT. REMOVED THE CSD FOR ENGINEERING EVALUATION OF THE GEARBOX. REPLACED NR 1 ENGINE CSD GARLOC SEAL AND RETAINING RING PER BOEING MM.