As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 3357 - EN ROUTE TO DTW, THE ELEVATOR WOULD OCCASIONALLY PITCH UP OR DOWN ABRUPTLY, GIVING UP TO AN 800 FPM VERTICAL SPEED. THE AIRCRAFT CONTINUED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE PERSONNEL REPLACED BUSHINGS AT THE LOWER PITCH TRIM ACTUATOR MOUNT LUGS. ALL SYSTEMS OPERATED SATISFACTORILY. (M)