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 APU FIRE TEST FAILS. MAINTENANCE INSPECTED AND FOUND A LOOSE CONNECTOR ON THE FIRE LOOP. MAINTENANCE TIGHTENED THE CONNECTOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 26-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.