As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPERATIONAL CHECK OF CABIN EMERGENCY LIGHTS {A3NB-33-3-6012} - FOUND FAULT EPSU BATTERY AFT LEFT REPLACED EPSU 13WL BATTERY PER AMM TASK 33-51-38-000/400-002-A. EMERGENCY LIGHTING TEST OK. NO FAULTS FOUND.PARTS USED: 18-3351-3-0001, QTY :1