What was found
THE NR 2 ENG SPOOLED DOWN TO IDLE RPM SHORTLY AFTER TAKEOFF. FUEL WAS DUMPED AND THE AIRCRAFT WAS RETURNED. MAINTENANCE FOUND THE NR 2 ENG FUEL PUMP HAD FAILED. THE NR 2 ENG FUEL PUMP WAS REMOVED AND REPLACED. IN ADDITION, THE FUEL/OIL HEAT EXCHANGER AND ENG FUEL CONTROL WERE REPLACED AS A PRECAUTIONARY MEASURE. FUEL LEAK CHECKS WERE ALSO GOOD. *S/D* THE FUEL PUMP AND FUEL CONTROL UNIT WERE BOTH TESTED IAW THE CF6 COMPONENT MM AND NO TROUBLE WAS FOUND. THIS AIRCRAFT HAD AN ABORTED TAKEOFF THE FOLLOWING DAY (10/24) FOR THE SAME PROBLEM. ENGINEERING REPORTED THAT THE NR 2 ENGINE FIRE SHUTOFF VALVE WAS RERIGGED AT THAT TIME, AND IT CORRECTED THE PROBLEM.