As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE NR 1 ENGINE OIL COOLER OUTLET LINE WAS LEAKING AT THE CONNECTION TO THE OIL COOLER. UPON INSPECTION, IT WAS DISCOVERED THAT THE OUTLET LINE O-RING WAS DAMAGED, NICKED. THE LINE/O-RING HAD BEEN IN PLACE SINCE MFG. MAINTENANCE REPLACED THE O-RING AND THE ACFT WAS RETURNED TO SERVICE.