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 LAS VEGAS MAINTENANCE REPORTED THAT THE OVERWING HATCH EXIT SIGNS WOULD NOT SHUT OFF. FOUND POWER SUPPLY (NOT IDENTIFIED) MISWIRED AT THE TERMINAL STRIP. CORRECTED WIRING. OPERATIONAL CHECK GOOD PER AMM 33-53-00. AIRPLANE HAS RETURNED TO SERVICE.