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 SUPPLY UNITS WOULD NOT TEST. THE AIRCRAFT WAS FERRIED TO PIT WHERE MAINTENANCE INSPECTED AND REPLACED BOTH EMERGENCY POWER SUPPLY UNITS IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 33-00-00. OPERATIONAL TESTS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.