As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT HAD THE EMERGENCY BATTERY CHANGED PRIOR TO FLIGHT 4189. HOWEVER, ON THE TAXI FROM THE GATE THE EMERGENCY LIGHTING AT ROWS 3 AND 4 DIDN'T ILLUMINATE. THE FLIGHT RETURNED TO THE GATE WHERE MAINTENANCE CHANGED THE POWER SUPPLY IN ACCORDANCE WITH MAINTENANCE MANUAL 33-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.