As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT INSPECTION, THE PILOTS NOTED THERE WAS OIL STREAKING FROM THE LT ENGINE COWLING BACK TO THE T/E OF THE FLAP. INSPECTION BY A MAINTENANCE TECH REVEALED THE OIL COOLER WAS LEAKING AT THE END OF THE COOLER ADJACENT TO THE INLET FITTING. FORTUNATELY, ONLY A SMALL AMOUNT OF OIL WAS VENTED BEFORE THE LEAK WAS FOUND. THE OIL COOLER HAD RECENTLY BEEN INSTALLED IN NEW CONDITION DURING AN ENGINE CHANGE 2 MONTHS PRIOR AND HAD ACCRUED ONLY 128 HOURS TIS.