What was found
ON TAKEOFF ROLL AT YYC EN ROUTE, THE CAPTAINS AIRSPEED IND READS 20 KTS LOWER THAN 1ST OFFICERS & STANDBY AIRSPEED IND. T/O REJECTED AT SPEED OVER 100 KTS. MAINT INSTALLED PITOT STATIC TESTER, BOTH PILOTS & 1ST OFFICERS ALTIMETERS TESTED GOOD UP TO 1200 FT. WATER FOUND & DRAINED FROM CAPTAINS PITOT STATIC SYSTEM. A FUP WAS WRITTEN TO PERFORM AN INSPECTION OF THE CAPTAINS PITOT PROBE PER AMM TASK 34-11-15-200-001, AND FUNCTIONAL TEST ENTIRE SYSTEM PER 34-13-00-720-009. WHEN THE AIRCRAFT ARRIVED BACK IN PHX, MAINTENANCE REMOVED AND REPLACED THE LT PITOT PROBE IAW AMM 34-11-15-401. OPERATIONAL CHECK WAS GOOD IAW AMM 30-31-00-710. VENDORS FUNCTIONAL TEST OF PITOT PROBE S/N 4911 CONFIRMED FAILURE OF UNIT.