As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE DOOR AND GEAR DISAGREE WARNING MESSAGE JUST AFTER TAKEOFF. PERFORMED QRH PROCEDURE AND RETURNED TO MSP. (FLT#3874) FO: 03/04/2019 CLOSED REMOVED AND REPLACED NLG OLEO PROX SENSOR BRACKED AND REINSTALLED SENSOR. OPS CHECK GOOD IAW AMM.