As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIRECTLY AFTER TAKE OFF TRIED TO PULL UP GEAR GAVE WARNING WITH GEAR DISAGREE UPPER NOSE GEAR DID NOT RETRACT DECLAIRED EMERGENCY. / REMOVED AND REPLACED PSEU IAW CRJ 900 AMM 32-61-01-000/400-801, OPS CHECKS GOOD. WHILE TRYING TO PERFORM GEAR RETRACTION/EXTENSION CHECK NLG WOULD NOT CENTER. LUBRICATED NLG STEERING COLLAR IAW CRJ900 AMM 12-20-32-640-801. PERFORMED CENTERING CHECK IAW CRJ900 AMM 32-30-00-710-801, OPS CHECKS GOOD.