As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERG LIGHT: EMERGENCY CABIN LIGHTING STARTED FLASHING ON THE DECENT INTO BOSTON. *** CORRECTIVE ACTION *** COMPLIED WITH TROUBLESHOOTING PRECEDURE AS OUTLINED IN SL NO 505-33-0005. FOUND # 2 EMERGENCY BATTERY NOT OPERATING THE EMERGENCY LIGHTS AT ALL WITH OUT THE #1 BATTERY CONNECTED. REMOVED AND REPLACED #2 EMERGENCY BATTERY WITH NEW CUSTOMER SUPPLIED EMERGENCY BATTERY.