As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - CREW REPORTED AFTER TAKEOFF GEAR DISAGREE LIGHT ILLUMINATED. EMERGENCY DECLARED FLIGHT RETURNED MIA LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT MAIN GEAR UPLOCK SENSOR THAT HAD FAULTED. SYSTEM GROUND CHECK NORMAL OPERATION.