As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT, THE CREW NOTICED A SMALL BUT STEADY DECREASE IN THE OIL QUANTITY ON NR 1 ENGINE. THE AIRCRAFT WAS DIVERTED AND A POST-FLIGHT INSPECTION FOUND THE STARTER DRIVE PAD CARBON SEAL LEAKING. THE CARBON SEAL WAS REPLACED AND GROUND CHECKED SERVICEABLE.