As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5857 - INBOUND TO CVG RECEIVED A LANDING GEAR DISAGREE MESSAGE, CREW DECLARED AN EMERGENCY, ABORTED APPROACH THEN LANDED WITHOUT INCIDENT ON SECOND ATTEMPT. CHECKED UPLOCK AND PROXIMITY SENSORS FOR CORRECT ADJUSTMENT, LUBRICATED LANDING GEAR AND PERFORMED GEAR SWINGS. DISCREPANCY COULD NOT BE DUPLICATED BY MAINTENANCE.