What was found
FAT - LEFT ENGINE TORQUE FLUCTUATION REPORTED DURING TAKEOFF ROLL. TAKEOFF ABORTED WITHOUT INCIDENT. ENGINE GROUND RUN-UP ACCOMPLISHED AFTER ABORTED TAKEOFF. UNABLE TO DUPLICATE DISCREPANCY. SUBSEQUENT TAKEOFF ATTEMPT ABORTED WITHOUT INCIDENT DUE TO SAME DISCREPANCY. MAINTENANCE SWAPPED LEFT TORQUE INDICATION FROM BRIDGE '1' TO BRIDGE '2'. PERFORMED ENGINE GROUND RUN. LEFT ENGINE TORQUE INDICATION NORMAL DURING GROUND CHECK. AIRCRAFT RETURNED TO SERVICE. (X)