As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 524 - MCI TO RDU - DURING PREFLIGHT CK, FLIGHT CREW DISCOVERED THE EMERGENCY LIGHTS WILL NOT SHUT OFF. MX PERSONNEL INSPECTED AND FOUND CONNECTOR ON NR 3 EMERGENCY BATTERY NOT PROPERLY SECURED. MX PERSONNEL RESECURED AND OPERATIONALLY CHECK EMERGENCY LIGHTING SYS AGAIN AND ALL CHECKED GOOD. AIRCRAFT WAS RELEASED TO RETURN FOR SERVICE IN AIRWORTHY CONDITIONS.