As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE PROP BRAKE HAD TO BE REMOVED AND DURING THE REMOVAL, THE PROP BRAKE FLANGE SEAL WAS DISTURBED. THE LATTER BEGAN TO LEAK OIL ON THE NEXT FLIGHT. THE ENGINE HAD TO BE SHUT DOWN DUE TO LOW OIL LEVEL. THE SEAL WAS REPLACED, RUN-UP CARRIED OUT AND FOUND SERVICEABLE.