As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - CREW REPORTED CAPTAIN AND FIRST OFFICERS CONTROL WHEEL TRIM SWITCHES INTERMITANT IN FLIGHT. FLIGHT RETURNED MIA LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED STAB TRIM ACTUATOR. SYSTEM GROUND CHECK NORMAL OPERATION.