As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE AFTER TAKEOFF. NOSE GEAR REMAINED IN DOWN POSITION WITH GEAR LEVER IN UP POSITION. BOTH MAIN LANDING GEAR INDICATION DISPLAYED CORRECTLY IN UP POSITION. RAN QRH, MESSAGE EXTINGUISHED AND RETURNED TO FIELD. (FLIGHT 5134) DEFERRED LANDING GEAR RETRACTION SYSTEM PER CRJ 200 MEL 32-30-1. MX ACTION COMPLIED WITH AND PLACARDS INSTALLED. CAT II DOWNGRADED