As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED 'GEAR DISAGREE' AND 'NOSE DOORS WARNING MESSAGES ON TAKEOFF AFTER ATTEMPTING GEAR RETRACTION. NOSE GEAR WOULD NOT RETRACT. RAN QRH AND ALL GEAR EXTENDED WITHOUT HAVING TO DO MANUAL EXTENSION. (FLT#3715) FO: 12/27/2018 CLOSED REMOVED AND REPLACED TOWGUARD TOBARLESS TOWING COLLAR IAW AMM. PERFORMED OPS CHECK OF NLG RETRACTION SYSTEM. OPS CHECK GOOD.