As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C1 C CHECK, INSPECTION REPORTED THE OPERATIONAL TEST OF THE EMERGENCY LIGHTS FAILED WITH A FAULT MESSAGE OF "EPSU (13WL) AFT L/DEU B." MAINTENANCE REMOVED AND REPLACED THE EPSU IN ACCORDANCE WITH THE REQUIREMENTS OF AMM 33-51-38-000-001 AND AMM 33-51-38-400-001. UPON COMPLETION OF THE INSTALLATION, THE EPSU OPERATIONALLY CHECKED GOOD.