As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE, NR 1 GENERATOR FAILED, NO VOLTS OR HZ, NR 1 AC BUSS AND AC ESSENTIAL BUSS FELL OFF LINE. NR 4 GEN FELL OFF LINE MOMENTARILY WITH AC NR 2 BUSS OFF LINE ALSO. RESET NR 4 GENERATOR BUT ONLY ABLE TO REGAIN AC NR 2 BUSS. STARTED APU, APU GENERATOR SHOWED VOLTS AND HZ BUT UNABLE TO POWER AC NR 1 BUSS OR ESSENTIAL BUSS. MAINTENANCE REMOVED AND REPLACED PLUG CONNECTOR 1XB12R.