As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A DC BUS TWO FAIL WARNING MESSAGE ILLUMINATED DURING THE FLIGHT. THE AIRCRAFT RETURNED TO PIT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND RE-SET THE EXTERNAL POWER CIRCUT BREAKER, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 24-60-00. OPERATIONAL CHECKS WERE COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.