What was found
ON TAKEOFF ROLL, AT 100KIAS INDICATED, CAPTAIN`S AND STANDBY INDICATION READ 100, FIRST OFFICER WAS 80 KIAS. RECHECKED AT 120 KIAS AND F/O READ 100 AND DECREASING. AIRCRAFT ABORTED WITH NO FURTHER PROBLEMS. NO EICAS MESSAGES. UNABLE TO DUPLICATE REPORTED FAULT. PERFORMED LOW-RANGE PITOT STATIC LEAK CHECK IAW AMM34-11-00, NO FAULTS FOUND. REPLACED RIGHT ADC PRECAUTIONARY IAW AMM 34-12-01. OPS CHECK NORMAL. IDT QC942 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1456546 S/N OFF 05027 COMPUTER, AIR D OFF 19-3412-9-0003 5027 ON 19-3412-9-0003 5966.