As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED NOSE UP PITCH TRIM(UNCOMMANDED) RIGHT AFTER TAKEOFF. POSSIBLE PITCH TRIM RUNAWAY. AURAL WARNING"TRIM, TRIM" BUT NO EICASE MESSAGE. SMOOTH LANDING REPORTED ON AIR RETURN BACK TO EWR. MX REMOVED AND REPLACED THE F/O'S YOKE PITCH TRIM SWITCH WITH OPERATIONAL AND CHECK FLIGHT GOOD. A/C WAS APPROVED FOR RETURN TO SERVICE.