As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER A NORMAL FLIGHT, THE PILOTS NOTICED THERE WAS A LARGE OIL STREAK ON THE LT SIDE OF THE ACFT THAT ORIGINATED FROM UNDER THE ENGINE COWL. THEY ALSO NOTED THAT THERE WAS LESS THAN 4 QTS OF OIL IN THE ENGINE, DESPITE LEAVING FOR THE 2 HR FLIGHT WITH OVER 7 QTS. MAINTENANCE PERSONNEL NOTED THE LEAK WAS COMING FROM THE OIL COOLER.