As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3645 - ABORTED TAKEOFF, DUE TO FIRST OFFICER AIRSPEED INDICATOR HAD NO INDICATION AND NO FLAG. ADU DISPLAYED DADC DATA INVALID. CLEANED BLOCKAGE FROM FIRST OFFICERS PITOT TUBE. FUNCTIONAL CHECK WAS SATISFACTORY IAW ATR MM 34-10-00 FUT AND AIRCRAFT WAS RETURNED TO SERVICE. (M)