What was found
(CAN)AFTER NUMEROUS ATTEMPTS TO LOCATE AND REPAIR A SMALL OIL LEAK ON THE #1 ENGINE, INCLUDED IN THE FIXES WERE SEAL REPLACEMENT OF THE STARTER GENERATOR, FCU, FUEL PUMP DRIVE, FRONT CASE PROP SEAL, NONE O F THESE REPAIRS CURED THE OIL LEAK. AFTER MUCH TROUBLESHOOTING THE OIL COOLER WAS REPLACED AND THE PROBLEM WAS RECTIFIED. A PRESSURE TEST OF THE OIL COOLER REVEALED A STEADY STREAM OF AIR BUBBLES FROM THE LOWER LEFT HAND CORNER OF THE COOLER WHERE THE COOLING FINS MEET THE OIL COOLER CASE.