What was found
ENROUTE, WITH THE LEFT GENERATOR ON MEL FOR RT GENERATOR NOT PICKING UP THE LT GENERATOR LOAD, AND APU OPERATING, THE APU PERFORMED AN AUTO SHUTDOWN. FLIGHT DIVERTED TO PIT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LT GCU, AND SUBSEQUENTLY (06JUL03), REPLACED THE STANDBY POWER MODULE AND RT GENERATOR BUS TIE BREAKER. A BITE WAS PERFORMED ON THE APU WITH NO FAULTS FOUND. MAINTENANCE CLEANTED AND ADJUSTED THE APU DOOR LIMIT SWITCH.