As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXTENDED GEAR AT 180 KTS, RECEIVED GEAR DISAGREE WARNING MESSAGE. AFTER ABOUT 20 SECONDS, THE GEAR INDICATED DOWN BEFORE WE COULD EVEN START THE QRH PROCEDURE. (FLT#5574) CLOSED REMOVED AND REPLACED NLG UPLOCK ROLLER AND BRACKET WITH SERVICEABLE UNITS. OPS CHECK GOOD AT THIS TIME. PERFORMED FULL STRUT SERVICE OF NLG STRUT IAW AMM.