As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT, THE PROXY SYSTEM AND THEN THE NR 2 DATA ACQUISITION UNIT FAILED. FLIGHT 4069 THEN RETURNED TO PIT. MAINTENANCE THEN INSPECTED AND REPLACED THE NR 2 DATA ACQUISITION UNIT IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 31-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.