As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INCIDENT OCCURRED AFTER DEPARTURE FROM DTW AND DURING CLIMBOUT AT 11000 FT WITH AUTOPILOT ENGAGED IN SMOOTH AIR, CONTROL WHEEL JOLTED FWD BRIEFLY AND "UNCOMMANDED STAB" AMBER ICAS MESSAGE ILLUMINATED. NO FURTHER UNCOMMANDED INPUTS TO STAB OCCURRED. AIRCREW COMPLIED WITH APPROPRIATE CHECKLIST REQUIREMENTS. AC RETURNED WITHOUT FURTHER INCIDENT. (K)