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 BOTH LEFT AND RIGHT AFT OVERWING HATCH 'EXIT' SIGNS WOULD NOT TEST. LAS VEGAS MAINTENANCE FURTHER REPORT THE REMOVAL AND REPLACEMENT OF THE EMERGENCY LIGHT POWER SUPPLY BATTERY PACK AT FS 990R. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 33-53-00. THE AIRPLANE HAS RETURNED TO SERVICE.