As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 1994 - IAH - THE LEFT GENERATOR TRIPPED OFF FOLLOWED BY ILLUMINATION OF THE DC EMERGENCY BUS OFF LIGHT. THE GENERATOR BUS OFF LIGHT PROCEDURES WERE FOLLOWED AND THE DC BUS CROSSTIE SWITCH WAS CLOSED. THE DC EMERGENCY BUS LIGHT CAME ON AND THE AIRCRAFT WAS RETURNED TO IAH. MAINTENANCE FOUND THE LEFT GCU AT FAULT. THE LEFT GCU WAS REMOVED AND REPLACED. THE ENGINES WERE RUN AND THE SYSTEM CHECKED GOOD. (M)