What was found
NO AIRSPEED INDICATION AT 80/KTS. REJECTED TAKEOFF, RETURNED TO GATE FOR FUEL. SUSPECT BAD ADC. FAC ORDERED TO MSN 1151676 AND THE ADC IS ORDERED TO MSN 1151673. NOTE THAT THE INFORMATION ON F/O SIDE IS GOOD. THE STANDBY AIRSPEED INDICATORS INFORMATION AND DISPLAY IS GOOD. THE STANDBY AIRSPEED INDICATORS INFORMATION & DISPLAY IS GOOD. FOUND CAPTAINS PITOT PROBE PLUGGED. REMOVED SOME TYPE OF CRUSTED MATERIAL FROM PROBE, CHECKED AGAIN WITH REVERSE FLOW AIR PRESSURE. STILL HAD SOME RESTRICTION. R & R CAPTAINS PITOT PROBE IAW MM 34-11-15-4. PURGED ENTIRE PITOT SYS FROM ADS COMPUTER TO PROBE, CHECKS GOOD. PERFORMED PITOT LEAK & CALIBRATION CHECK, CHECKS GOOD. SYS OPS CHECKS NORMAL PER MM 34-11-15-6.