What was found
IN DECENT AT 3000 FEET, CLEAR AIR, NO MOISTURE, CLEARED FOR VISUAL, REDUCED POWER FROM APPROX 75% N1 TO 68% N1 TO START DESCENT. THE MASTER WARNING ILLUMINATED & THE RT ENG SHUTDOWN UNCOMMAND. NO OTHER OBSERVATIONS NOTED TO CAUSE OCCURRENCE. COULD NOT DUPLICATE ON GND RUNS. THRU EXTENSIVE TROUBLESHOOTING COULD NOT FIND A DECISIVE DEFECTIVE PART, RIGGING OR AIRFRAME ISSUE. REPLACED FUEL CONTROL & FLOW DIVIDER AS A PRE-EMPTIVE MEASURE. BOTH HAD 934.6 HOURS OF OPERATION SINCE OVERHAUL.