As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT A SECTION OF THE EMERGENCY LIGHTS WOULD NOT TEST. MAINTENANCE INSPECTED AND REPLACED THE 5LK BATTERY IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 33-51-00. OPERATION CHECKS WERE COMPLETED AND THE AIRCRAFT RETURNED TO SERVICE.