As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX ON FLIGHT 2340- UNSAFE LEFT GEAR LIGHT AFTER TAKEOFF. THE LIGHTS ON WERE AMBER, RED, AND GREEN HANDLE. FLIGHT ATTENDANTS REPORTED THE LEFT GEAR REMAINED DOWN. PERFORMED EMERGENCY PROCEDURE, RECYCLED GEAR TO ACHIEVE 3 UP SAFE. LATER EXTENSION NORMAL. AIRCRAFT DIVERTED TO PDX AND LANDED SAFELY. REMOVED AND REPLACED LEFT MAIN LANDING GEAR MECHANICAL SEQUENCE VALVE. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.