As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, A PROXY FAIL WARNING MESSAGE ILLUMINATED DURING GEAR RETRACTION. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED, WITHOUT ANY FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REPLACED THE LEFT DOWN LOCK SWITCH HARNESS IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 32-61-05. FUNCTION CHECKS WERE COMPLIED WITH AND THE AIRCRAFT WAS RETURNED TO SERVICE.