As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTING SYSTEM BATTERY FAILED BITE TEST. EPSU BATTERY REQUIRES REPLACEMENT. SDR REQUIRED-VERIFIED NR 5001092339-0010 EPSU BATTERY 13WL REPLACED IAW AMM 33-51-38-000/400-002-A REV 69. OPC OF THE EPSU THRU BITE CHECK PERFORMED AS PER AMM 33-51-00-710-001 REV 69 TEST OK. SDR GENERATED