As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - ON FLIGHT NUMBER 2507, 10 MINUTES INTO FLIGHT, RECEIVED A GEAR DISAGREE WARNING MESSAGE WHEN GEAR WAS SELECTED UP. AN EMERGENCY CHEKLIST WAS PERFORMED. EMERGENCY GEAR EXTENSION WAS PERFORMED. AIRCRAFT LANDED WITHOUT INCIDENT. REMOVED AND REPLACED LANDING GEAR SELECT VALVE. OPERATIONAL CHECK GOOD. NO DAMAGE OR DEFECTS FOUND. AIRCRAFT RETURNED TO SERVICE.