What was found
FLT 4094 - DURING TAKEOFF ROLL, CAPTAIN'S AIRSPEED INDICATOR STOPPED AT 68 KNOTS. CREW ABORTED TAKEOFF AND RETURNED TO THE GATE. MAINTENANCE INSPECTED AIRCRAFT AND DISCOVERED ICE ACCUMULATION IN CAPTAIN'S PITOT TUBE, THEY THEN ACTIVATED PITOT HEATER SYSTEM TO THAW ICE FROM SYSTEM. CONDUCTED HIGH SPEED TAXI, OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.