As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECLARED EMERGENCY DUE TO A LANDING GEAR DISAGREE MESSAGE AFTER GEAR EXTENSION FOR APPROACH. GEAR DOORS STAYED OPEN DUE TO A RT DOWN LOCK 14GA PROX SENSOR FAULT. ALL NORMAL AFTER SECOND GEAR EXTENSION. CORRECTIVE ACTION: FOUND SENSOR HARNESS STUCK BETWEEN SENSOR AND TARGET BRACKET. SYSTEM STARTED WORKING NORMALLY AFTER REROUTING HARNESS TO THE CORRECT POSITION. (LP: 8851404, AIRCRAFT WAS GROUNDED)