As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED GEAR DISAGREE WARNING MESSAGE ON APPROACH. FOLLOWED QRH PROCEDURE AND AFTER FIRST CYCLE OF THE GEAR HANDLE, ALL GEAR WENT DOWN AND LOCKED. LANDED AND TAXIED TO GATE WITH NO FURTHER INCIDENTS. (FLT#3702) REMOVED AND REPLACED NLG UPLOCK ROLLER AND MOUNT BRACKET WITH A SERVICABLE UNIT IAW CMM. PERFORMED GEAR SWING IAW AMM, OPS CHECK GOOD AT THIS TIME.