As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT, NR 3 AND NR 4 BUS TIES OPENED. SPLIT BUS SYSTEM OPEN. NR 3 GENERATOR WAS DISCONNECTED. NR 4 GENERATOR CHECKED GOOD VOLTS/ FREQ. NR 3 BUS LOST POWER AND COULD NOT REPOWER. DUMPED 17.0 KGS OF FUEL PRIOR TO LANDING. REMOVED AND REPLACED RIGHT BUS PROTECTION UNIT IAW MM. ALL OPS OK DURING ENGINE RUNS AND APU GENERATORS.