As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, SELECTED GEAR DOWN. MAINS EXTENDED NORMALLY, NOSE GEAR SHOWED YELLOW SLASHES. GEAR DISAGREE ANNUNCIATED. RAN QRH, ALL GEAR EXTENDED NORMALLY. (FLT 4556) CLOSED REMOVED AND REPLACED THE NLG UP LOCK PIN IAW AMM AND COMPLIED WITH ALIGNMENT OF THE NLG UP LOCK PIN IAW AMM. LANDING GEAR SWINGS AND OPERATIONAL CHECKS GOOD.