As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERG EXIT SIGN/LIGHT STARTED FLICKERING IN CRUISE ONE HR INTO THE FLIGHT. DURING THE CHARGE PART OF TASK CARD TC·E50·33-1001 THE EMER LIGHTS WOULD NOT EXTINGUISH LN ARM. GAINED ACCESS TO BOTH #LAND #L BATTERIES AND TROUBELSHOT TO THE #L BATTERY. REMOVED ANO REPLACED THE #L BATTERY ALL OPS CHECKS SATISFACTORY. CLOSED ALL ACCESS. REF EMBSOS AMM 33·52·01 AND EMBSOS FIM 33-50-00