What was found
CREW REPORTED THAT AT HIGHER ALTITUDE, FL 360-300, WHEN POWER BROUGHT UP FROM IDLE 3 RAPID POPPING SOUND HEARD, OCCURRED 3 TIMES. POPPING SOUND NOT HEARD BELOW FL 240. AT IDLE FUEL FLOW WOULD DROP TO ZERO ON THE NR 2 ENGINE. DURING APPROACH CREW REPORTED FLAP SPLIT AT 5 AND 7, AND FLAPS WOULD NOT GO TO LANDING POSITION OF 10. CREW DECLARED EMERGENCY AND LANDED IN LAS WITHOUT FURTHER EVENT. MX BOROSCOPED AND RAN NR 2 ENGINE. NO DAMAGE TO NR 2 ENGINE NOTED, FUEL PROBLEM DID NOT DUPLICATE. MX FOUND NR 7 FLAP TRACK FAIRING "A" FRAME MISSING HARDWARE WHICH ALLOWING CANOE TO BEAT AGAINST THE BOTTOM OF FLAP. R & R THE NR 7 FLAP TRACK CARRIAGE "A" FRAME IAW BOEING 737-300 MM 27-51-52. OPERATIONAL CHECKS GOOD.