As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION LAS VEGAS, MAINTENANCE REPORTED THAT THE CEILING MOUNTED EMERGENCY LIGHTS FROM SEAT ROW 25 TO SEAT ROW 28 WOULD NOT TEST. LAS VEGAS MAINTENANCE FURTHER REPORT THE REMOVAL AND REPLACEMENT OF AN EMERGENCY LIGHT POWER SUPPLY BATTERY PACK AT FS 1057R. A SATISFACTORY OPERATIONAL CHECK WAS PERFORMED PER AMM 33-53-00. THE AIRPLANE HAS RETURNED TO SERVICE.