As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6217 - IAD-PVD - DURING CRUISE, AN UNSCHEDULED LANDING AT IAD DUE TO FLIGHT CONTROL WARNING LIGHT ILLUMINATED, FLIGHT CONTROLS OPERATED NORMALLY. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND RESET PITCH CONTROL DISCONNECT UNIT, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)