What was found
ON TAKEOFF ROLL CAPTAIN`S AIRSPEED WAS 80 KTS, FIRST OFFICER`S 120. REJECTED TAKE OFF AT 125 KTS, AFTER DEICE & SECONDARY DEICE. PERFORMED PITOT STATIC LEAK CHECK, FOUND CAPTAIN`S AIR SPEED INDICATOR AT FAULT. IAW AMM 34-11-01 R & R CAPTAIN`S AIR SPEED INDICATOR IAW AMM 34-13-02. OPERATIONS CHECKED NORMAL, OK TO CONTINUE. ROTABLE PARTS CHANGE WAS INDICATED TT 1562406, SN OFF 03564 INDICATOR, MACH OFF 99-3413-9-0003 3564 & ON 99-3413-9-0003 3750.