What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF ROLL AT 50 KIAS: CAPTAINS AIR SPEED INDICATOR SHOWED ZERO. FIRST OFFICERS SHOWED 50 KIAS. MULTIPLE ECAM MESSAGES DISPLAYED. TWO OF THEM WERE AUTO PILOT OFF AND AUTO THRUST OFF. MAINTENANCE FLUSHED BOTH TOTAL PRESSURE LINES; THE CAPTAINS HAD SOME DEBRIS IN THE CAPTAINS PITOT AND THE FIRST OFFICERS PITOT WAS CLEAN. MAINTENANCE ALSO REPLACED THE FIRST OFFICERS AIR DATA MODULE PER AMM 34-11-17. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 34-13-00-790-002-A AND 34-13-00-720-009-B.