As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, FLIGHT CREW WAS UNABLE TO PARALLEL THE NR 2 AC BUS. FLIGHT CREW ELECTED TO RETURN TO DEPARTURE GATE FOR MAINTENANCE. A/C RETURNED TO GATE WITHOTU FURTHER INCIDENT. MAINTENANCE PERSONNEL REPLACED NR 2 AC BUS TIE RELAY. RETURN TO SERVICE TEST PERFORMED WITH NO FAULTS NOTED. A/C RETURNED TO SERVICE. (M)