As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- ON APPROACH RM GEAR FAILED TO EXTEND DOOR UNSAFE LIGHT ILLUMINATED AFTER COMMENCING MISSED APPROACH GREEN LIGHT ILLUMINATED LEFT GEAR EXTENDED. LANDED NORMALLY. FERRIED THE AIRCRAFT TO PDX FOR REPAIRS. REMOVED AND REPLACED RT MLG UPLOCK ASSY IAW Q400 AMM 32-31-21-400-801. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.