As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST LEFT OIL QUANTITY AND PRESSURE. ENGINE SHUTDOWN. THE MAIN GEARBOX IDLER SHAFT BEARING FAILED AT ITS INNER RACE. CONFIGURATION WAS POST SB PW4G-112-72-149. THIS SB WAS INTRODUCED TO PREVENT SPINNING OF THE SPUR GEAR ON THE OUTER RACE. FAILURE OF THE INNER RACE ALLOWED THE REMAINDER OF THE BEARING AND SPUR GEAR TO SPIN ON THE IDLER SHAFT. THEREFORE, DRIVE TORQUE TO THE DE-OILER WAS LOST. THIS RESULTED IN OIL EXITING THE ENGINE THROUGH THE OVERBOARD BREATHER PORT.