As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - EEL - DURING 8-DAY CHECK FUNCTIONAL TEST OF EMERGENCY LIGHT SYSTEM, RT OVERWING EMERGENCY POWER SUPPLY UNIT (12WL) FAULTED. MAINTENANCE REMOVED AND REPLACED RT OVERWING EMERGENCY POWER SUPPLY UNIT (12WL), OPERATIONAL CHECK WAS GOOD.