As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI FOR TAKEOFF, A PROXY SYSTEM FAIL WARNING MESSAGE ILLUMINATED. THE AIRCRAFT RETURNED TO THE GATE. OUTSTATION MAINTENANCE INSPECTED AND CLEANED THE LDGLK1 CANNON PLUG, THEN PERFORMED OPERATIONAL TEST IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 32-60-00. THE AIRCRAFT WAS RELEASED FROM MAINTENANCE.