As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR FLIGHT 2815 THE CLEANING CREW LEFT THE EMERGENCY LIGHTS ON. ALL EMERGENCY LIGHTS WERE FOUND TO BE INOPERABLE. THE FLIGHT WAS CANCELED. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED SEVERAL OPERATIONAL CHECKS OF THE EMERGENCY LIGHT SYSTEM IAW AMM 33-50-00, NO DEFECTS NOTED AT THIS TIME. NO PARTS REMOVED OR REPLACED THE AIRCRAFT WAS RETURNED TO SERVICE.