What was found
ON TAKEOFF AT APPROX 80 KNOTS, CREW RECEIVED AN AMBER EPR MODE FAULT. AN AMBER N1 DEGRADED MODE MSG AS WELL AS AURAL ALERT & CAUTION LIGHT. CREW REJECTED TAKEOFF & RETURNED TO GATE. AMBER AUTO THRUST OFF MSG DISPLAYED. PERFORMED TSM TASK 73-22-00-810-817-B. RAN ENG NR 1 FOR 3 MINUTES. NO SYS FAULTS. SYS OPERATIONS CHECKED NORMAL AT THIS TIME. ACFT OK FOR SERVICE. THE PROBLEM REOCCURRED PRIOR TO THE NEXT TAKEOFF. THE NR 1 ENG EPR INDICATOR FAILED & RECEIVED AMBER EPR MODE FAULT & AMBER N1 DEGRADED MODE & AMBER AUTO THRUST OFF MSGS. AFTER ENG SHUTDOWN, TWO CLASS II MSGS, ENG 1 EIU & ENG 1 FADEC MSG DISPLAYED. R & R ENG NR 1 P2 & T2 SENSOR IAW AMM 73-22-11-000-010-A & AMM 73-22-11-400-010-A. PERFORMED OPERATIONAL TEST & HEATER TEST IAW AMM 73-22-11-710-040 & AMM 73-22-11-710-040-A. R & R ENG 1 EIU IAW AMM 73-25-34-000-041-A & AMM 73-25-34-710-042. OPERATIONS CHECKED GOOD. ACFT OK FOR CONTINUED SERVICE.