What was found
UPON INITIAL DESCENT, FROM A CRUISING ALTITUDE OF 45,000 FT, THE PILOT BEGAN REDUCING ENGINE POWER. THE NR 2 ENGINE ROLLED BACK TO IDLE, THEN SHUTDOWN UNCOMMANDED. THE PILOT ATTEMPTED TO RESTART THE NR 2 ENGINE, BUT WAS UNSUCCESSFUL. THE LANDING WAS UNEVENTFUL. UPON INVESTIGATION OF THE INCIDENT BY MAINTENANCE TECHS, IT WAS DISCOVERED THAT A RECENTLY REPLACED FUEL DELIVERY UNIT, FDU, HAD FAILED. THE FDU WAS REPLACED 2 DAYS EARLIER DURING A SCHEDULED MAINTENANCE EVENT. THE FDU FOR BOTH ENGINES WAS REPLACED WITH REPAIRED FDUS WHILE COMPLYING WITH SB FJ44-73-044, REV 4. THE PART HAS BE SENT TO THE ENGINE MFG FOR TEARDOWN AND ANALYSIS.