What was found
ON TAKEOFF ROLL AT PHX EN ROUTE FOR PHL RECEIVED ECAM MESSAGE FOR AUTOFLIGHT, AUTOTHRUST, AND TWO OTHER MESSAGES THAT WE WERE NOT ABLE TO READ DUE TO TIME CONSTRAINT. REJECTED TAKEOFF JUST PRIOR TO 80 KTS. MAINTENANCE TROUBLESHOT AND REPLACED THE NR 2 AIR DATA INERTIAL REFERENCE UNIT (ADIRU) IAW T/C R2A34304. RESTORED AIRCRAFT TO CAT IIIB STATUS. VENDOR BENCH TEST CONFIRMED FAILURE OF ADIRU S/N 2016. REPLACED ELECTRONIC SENSOR ASSEMBLY P/N; 465750-03, S/N; 5212, AND LOW VOLTAGE POWER SUPPLY. PERFORMED THERMAL CALIBRATION, TESTED UNIT, AND RETURNED TO SERVICE.