As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE GEAR DID NOT GO DOWN & LOCKED AFTER EXTENDING GEAR. ALSO RECEIVED GEAR DISAGREE WARNING MESSAGE. RECYCLED ONCE AND IT EXTENDED NORMALLY. REMOVED AND REPLACED NOSE LANDING GEAR SELECTOR VALVE IAW CRJ MM 32-33-10. OPS AND LEAK CHECK GOOD.