What was found
PIT - DURING TROUBLESHOOTING OF A TCC (TURBINE CLEARANCE CONTROL) ACTUATOR FUEL LEAK, SIGNIFICANT DAMAGE TO THE INTERMEDIATE CASE HEAT SHIELDS AND THERMAL BLANKETS WAS NOTED FORWARD OF THE NR 3 BEARING BUFFER AIR COOLER. A MASSIVE AIR LEAK WAS DISCOVERED EMANATING FROM THE FORWARD FACE OF THE COOLER. IT WAS DETERMINED THAT THE DAMAGE TO THE THERMAL BLANKETS AND HEAT SHIELD WAS TOO EXTENSIVE TO REPAIR ON-WING. THE A/C WAS FERRIED TO PHL AND THE ENGINE WAS REPLACED. THE COOLER WAS REMOVED, AND IT WAS DETERMINED THAT THE FAILURE OF A WELD IN THE COOLER CASING WAS THE CAUSE OF THE AIR LEAK. (M)