As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF FROM KSTT, PITCH TRIM FAILED IN TAKEOFF POSITION. THE PILOT THEN FOLLOWED A QRH BUT UNABLE TO RESET THE HORIZONTAL STABILIZER CONTROL SYSTEM. THE PILOT REQUESTED RETURNING TO KSTT AND DECLARED AN EMERGENCY. AIRCRAFT LANDED SAFELY IN KSTT. SJU MAINTENANCE PERSONNEL TRAVELED TO KSTT TROUBLESHOT AND FOUND A HORIZONTAL STABILIZER ACTUATOR TO BE FAULTY. REMOVED AND REPLACED HORIZONTAL STABILIZER ACTUATOR IAW SA227 AMM 27-40-10. OPERATIONAL CHECKS GOOD.