What was found
MIA - FLT 489 - DURING CRUISE, NR 1 FWD BOOST PUMP CIRCUIT BREAKER TRIPPED. NR 1 AFT BOOST PUMP WAS ON MEL, FLIGHT CREW DECIDED TO RETURN TO MIA. AIRCRAFT LANDED MIA WITHOUT FURTHER INCIDENT. REPLACED FWD AND AFT FUEL BOOST PUMPS PER MM PROCEDURES. SYSTEM LEAK AND OPERATED NORMALLY WITHOUT POPPING CIRCUIT BREAKERS. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)