As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BGR - FLT 4415 - AFTER TAKEOFF, THE LEFT MLG WOULD NOT LOCK UP AFTER RETRACTION. AIRCRAFT RETURNED TO BGR AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LEFT MAIN GEAR UPLOCK ACTUATOR. SYSTEM TESTED GOOD. AIRCRAFT WAS RETURNED TO SERVICE. (X)