As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT RETURNED FROM FLIGHT WITH AN EXCESSIVE OIL LEAK ON THE LT ENGINE COWLS. INVESTIGATION DISCOVERED A CRACK IN THE OIL COOLER VERNATHERM INLET/OUTLET HOUSING. THE OIL COOLER WAS REPLACED WITH AZERO TIME UNIT AND CHECKED SERVICEABLE.THE OIL COOLER HAD BEEN INSTALLED 77.2 HOURS EARLIER AS PART OF A 3000 HOUR BENCH TEST REQUIREMENT.