As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE WE RECEIVED GEAR DISAGREE NOSE DOOR WARNINGS. NOSE GEAR REMAINS GREEN WHILE MAINS TURN WHITE. RETURNED TO YYC. REMOVED AND REPLACED NLG ASSEMBLY IAW CRJ MM TASK 2-21-00-000-801. GEAR SWINGS COMPLETED IAW CRJ MM 32-30-00-720-801. OPS CHECK GOOD. REMOVED AND REPLACED NLG STEERING ECU IAW MM 32-51-10-401-801.