As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT DURING THE EMERGENCY POWER SUPPLY TEST, ONLY THE TOP LIGHT CAME ON. MAINTENANCE INSPECTED AND REPLACED THE FORWARD EMERGENCY POWER SUPPLY IN ACCORDANCE WITH DORNIER MAINTENACE MANUAL 33-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.