As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4535, THE CREW REPORTED THE PITCH TRIM MAIN WAS INOPERATIVE AFTER TAKEOFF. THE CREW ELECTED TO RETURN TO DEPARTURE. THE AIRCRAFT LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED THE HORIZONTAL STABALIZER CONTROL UNIT IAW EMB-135 AMM 27-40-01. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.