As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING APPROACH ON LDG EXTENSION, GEAR DISAGREE. MLG DOWNLOCKED, NLG REMAINED UNLOCKED. GO AROUND MANEUVER PERFORMED BY FLIGHT CREW. ALTERNATE LANDING GEAR EXTENSION PERFORMED. ACFT LANDED AT DESTINATION AIRPORT. MAINTENANCE REPLACED THE NLG DOOR SELECTOR VALVE. ACFT RTS.