As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INITIAL CLIMB FROM CLT THE CREW RECEIVED A GEAR DISAGREE MSG. THE CREW RETURNED THE AIRCRAFT TO CLT. EMERGENCY DECLARED. AIRCRAFT LANDED SAFELY AND TAXIED TO THE GATE.MX FOUND NLG PISTON NOT GOING TO CENTER WHEN ON MECHANICAL CAM. DISASSEMBLED NLG FOUND UPPER BEARING RETAINING RING TO HAVE COME MISSPLACED CAUSING SEVERE SCORING AND HEAT DAMAGE INSIDE OF NLG ASSY. R&R NLG SHOCK ASSY. OPS CHECK GOOD.