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 EMERGENCY EXIT SIGNS AT THE OVERWING EXIT HATCHES WOULD NOT TEST. LAS VEGAS MAINTENANCE REPORT THE REMOVAL AND REPLACEMENT OF THE APPROPRIATE EMERGENCY LIGHT POWER SUPPLY UNIT. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 33-53-00. THE AIRPLANE HAS RETURNED TO SERVICE.