As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMER EXIT LIGHT TEST GIVES MESSAGE OF ESPU BATTERY EMERGENCY LIGHT &ESPU BATTERY . RESET BOTH ESPUS, NO HELP. REPLACED THE BATTERY PACK FOR ESPU 11WL & 12WL IAW AMM 33-51-38-000-002-A & 33-51-38-400-002-A, OPS CHECKED OK. ACCOMPLISHED THE INSPECTION OF THE INSTALLATION OF BATTERY PACKS AT 11WL AND 12WL AND OPERATIONAL CHECK.