As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - CREW REPORTED NO GREEN LIGHT INDICATION WHEN GEAR WAS EXTENDED. CREW PERFORMED GO-AROUND, RECYCLED GEAR AND RECEIVED ALL THREE GREEN DOWN AND LOCK. EMERGENCY DECLARED FLIGHT LANDED PHX WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED PIN IN CONNECTOR OF LEFT MAIN DOWN AND LOCK SENSOR THAT WAS CORRODED. SYSTEM GROUND CHECK NORMAL OPERATION.