As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH CA AND F/O PITCH TRIM WILL NOT GO BELOW 1/2 UNIT BELOW NEUTRAL. AIR RETURN TO DTW. MAINTENANCE REMOVED AND REPLACED MAIN PITCH TRIM ACTUATOR P/N D97439, S/N ON 98G18850, S/N OFF 97B3391, IAW AMM CHAPTER 27-30. ALL OPERATIONAL AND RIG CHECKS GOOD.