What was found
FLT 725 - MIA-MEX - CREW REPORTED NR 2 CROSSFEED VALVE WOULD NOT OPEN IN FLIGHT. AIRCRAFT RETURNED TO MIA, AIRCRAFT LANDED AT MIA WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND NR 2 FUELING VALVE SWITCH IN THE ON POSITION AT THE WING FUELING STATION. MAINTENANCE RESET THE SWITCH TO THE OFF POSITION, AN OPERATIONAL CHECK WAS ACCOMPLISHED OF THE NR 2 FUELING CROSSFEED VALVE AND WAS FOUND TO BE OPERATING NORMAL IAW BOEING 727 MM CH 28-20-0. AS A PRECAUTIONARY THE NR 2 FUELING VALVE SWITCH GUARD WAS REPLACED IN THE WING FUELING STATION. AIRCRAFT FLEW LATER THAT EVENING MIA-MEX-MID-MIA WITH NO FURTHER FUEL CROSSFEED VALVE PROBLEMS REPORTED. (M)