As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOW OIL PRESSURE WARNING, N1 DROP AND ROLLBACK ON DEPARTURE. PILOT COMMANDED IN FLIGHT SHUTDOWN AND RETURNED TO DEPARTURE AIRPORT. LOW OIL PRESSURE DUE TO LOSS OF OIL FROM FRACTURED NR 4 BEARING CARBON SEAL. N1 DROP CAUSED BY FAILURE OF N1 SPEED SENSOR.