As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - CREW REPORTED MAIN LANDING GEAR WOULD NOT RETRACT. EMERGENCY DECLARED FLIGHT LANDED SEA WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND UPLOCK SPRING BROKEN ON MAIN LANDING GEAR LEFT SIDE. REPLACED SPRING. SYSTEM GROUND CHECK NORMAL OPERATION.