As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL WAS NOTED TO BE COMING OUT OF THE RIGHT HAND ENGINE DRAIN, DURING THE TAXI OUT FOR TAKEOFF. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REPLACED THE RIGHT HAND PROPELLER CONTROL UNIT O-RING SEALS, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 61-21-10. LEAK AND OPERATIONAL CHECKS WERE COMPLETED.