What was found
APPROXIMATELY TWO MINUTES AFTER START WITH ENGINE AT IDLE AND ALL PARAMETERS NORMAL, THE NR 2 ENGINE SHUT DOWN. MAINTENANCE INSPECTED AND CHANGED THE ECU, THE HMU, THE ENGINE DRIVEN FUEL PUMP, AND THE PNEUMATIC IP CHECK VALVE. SUBSEQUENT ENGINE RUN WAS NORMAL AND THE AIRCRAFT RETURNED TO SERVICE. PART CAUSING PROBLEM TO BE DETERMINED.