As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6372 - IAD-HLB - DURING TAXI, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO LEFT GENERATOR FELL OFF LINE AND WOULD NOT RESET. AIRCRAFT RETURNED TO GATE AND WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED GCU, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETUREND TO SERVICE. (M)