What was found
ENROUTE, AT FL280, BATTERY BUS ANNUNCIATOR LIGHT ILLUMINATED. RESET BUS IAW CHECKLIST AND REDUCED ELECTRICAL LOAD. PROBLEM CORRECTED FOR A FEW MINUTES FOLLOWED BY LOSS OF NR 1 GEN LIGHT. ATTEMPTED RESET OF NR 1 GEN UNSUCCESSFUL. NR 1 GEN WAS SHUT OFF AND ELECTRICAL LOAD FURTHER REDUCED. AFTER A FEW MINUTES NR 2 GEN LIGHT ILLUMINATED. CREW CONTACTED AIRPORT AND INFORMED OF MECHANICAL DIFFICULTIES. AIRCRAFT DIVERTED, NO EMERGENCY DECLARED. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE DISPATCHED FOR REPAIR. FOUND NR 1 AND NR 2 GCU FAILED AND NR 2 GENERATOR FAULTY. REPLACED AND NR 1 AND NR 2 GCU, REPLACED NR 2 STARTER/GENERATOR. GROUND OPS GOOD. (K)