What was found
DECLARED EMERGENCY - ON DESCENT FROM FL 350, WITH THROTTLES AT IDLE AND N1 APPROX 60 PERCENT, NOTICED A LOUD POP AND VIBRATION COMING FROM NR 2 ENGINE, ON LEVEL OFF BOTH THROTTLES SLOWLY ADVANCED AND OPERATED NORMAL, AGAIN ON DESCENT RETARDED APPROX 60 PERCENT NR 2 LOUD POP SLIGHT EGT SPIKE. STABILIZED AT IDLE, SEVERAL CONTINUOUS COMP STALLS "POPS" WHEN THROTTLE WAS ADVANCED ABOVE 60 PERCENT NO LIMITS WERE EXCEEDED. REMOVED AND REPLACED NR 2 ENGINE MEC AND FUEL PUMP ASSY PER MM.