What was found
MIA - FLT 724 - FLIGHT DEPARTED MIA WITH THE NR 1 ENGINE CSD ON MEL FOR AN OIL LEAK. CON CLIMB-OUT, EN ROUTE TO CLT, THE APU GENERATOR DROPPED OFF LINE AT 700 FEET ABOVE GROUND LEVEL. CREW ATTEMPTED TO RESET THE GENERATOR WITH NO HELP. TWO MINUTES LATER, THE APU OVERSPEED LIGHT ILLUMINATED AND THE APU AUTO SHUTDOWN. FLIGHT RETURNED TO FIELD AT MIA AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOED AND REPLACED APU FUEL CONTROL UNIT AND THE APU COMBUSTOR ASSEMBLY, P/N 3604524. OPS CHECK AND LEAK CHECK GOOD. CLEARED NR 1 ENGINE CSD MEL BY REMOVING AND REPLACING THE CSD, P/N 735511A. (M)