As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ENGINE HAD OIL SEEPAGE FROM THE LT SIDE OF THE ACCESSORY GEAR BOX WHERE THE OIL COOLER TUBE INSERTS INTO THE ACCESSORY GEAR BOX CAVITY. ITEM WAS ACCESSED AND INVESTIGATED DURING THE MAJOR PERIODIC INSPECTION. THE REMOVAL OF THE OIL COOLER TUBE REVELAED THE LOWER END OF THE TUBE AND CHAFED INTO THE GEAR BOX CAVITY.