As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6211 - IAD-PVD - DURING TAXI, EXPERIENCED A DISCREPANCY WITH THE CENTER EMERGENCY LIGHTS NOT ILLUMINATING. AIRCRAFT RETURNED TO GATE WHERE MAINTENANCE CONTROL AND MAINTENANCE WAS NOTIFIED. MAINTENANCE REMOVED AND REPLACED THE BATTERY PACK FOR THE CENTER EMERGENCY LIGHTS IAW MX PROCEDURES. ALL CHECKS WERE ACCOMPLISHED AS OUTLINED IN THE MM. AIRCRAFT WAS THEN RELEASED FOR SERVICE. (M)