As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A MAINTENANCE RUN, THE LT ANTI-ICE CHECK VALVE CAME APART INTERNALLY AND SENT DEBRIS DOWNSTREAM TO THE WING ANTI-ICE VALVE AND THE DEBRIS BECAME LODGED IN THE WING ANTI-ICE VALVE. THE WING ANTI-ICE VALVE WAS JAMMED BY THIS DEBRIS AND JAMMED IN THE OPEN POSITION WHICH CAUSED BLEED AIR TO BE SUPPLIED TO THE LT WING LEADING CAUSING IT TO WARP.