As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT TEST LT WILL NOT ILLUMINATE WHILE PERFORMING COM TEST. ALL LIGHT CHECK AS COMING ON WITH TEST. REMOVED AND REPLACED L3 BATTERY PACK AND CHARGER ASSY IAW AMM 33-50. REMOVED AND REPLACED L4 BATTERY CHARGER ASSY IAW AMM 33-50.