As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - EEL - DURING EMERGENCY LIGHT TEST THE SYSTEM INDICATED OK, BUT FAILED TO ILLUMINATE THE EMERGENCY ESCAPE PATH LIGHTS. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY POWER SUPPLY UNIT (11WL), OPERATIONAL TEST WAS GOOD IAW AMM 33-51-00.