As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THE EMERGENCY POWER SUPPLIES FAILED TO TEST. MAINTENANCE HAD THE CREW RUN THE ENGINES FOR 10 MINUTES AND PERFORM AN OPERATIONAL CHECK IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 33-00-00. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.