What was found
ON TAKEOFF AT LAS EN ROUTE FOR CMH WITH THRUST SET TO FLEX, NR 2 WENT TO TOGA, AND NR 1 WENT TO FLEX OR REDUCED SETTING (10 O'CLOCK ON GAUGE). HAD ECAM MESSAGE NO FLEX TEMP SET, BUT FLEX WAS SET AT IDLE. UPPER ECAM POWER INDICATOR VARIED FROM TOGA TO CLIMB WITH NO CREW INPUT. REJECTED TAKEOFF AND RETURNED TO GATE. MAINTENANCE PERFORMED BITE TEST THROUGH CENTRAL FAULT DISPLAY SYSTEM ON FULL AUTHORITY DIGITAL ENGINE CONTROL NR 1 & 2, A & B CHANNELS, NO FAULTS WERE NOTED. PERFORMED BITE TEST OF ENGINE INTERFACE UNIT NR 1 & 2, NO FAULTS NOTED. PERFORMED ENGINE RUN TO TAKEOFF POWER WITH NO DEFECTS NOTED.