What was found
ON CLIMBOUT NAI ON, LEFT ENG N1 2% LOWER THAN R ENG. LEFT N1 SHOWED 103.1, R ENG SHOWED 105.5. AFTER NAI SWITCH OFF, BOTH ENG SHOWED SAME N1(<P>PERFORMED FIM TASK 77-12 FT 825, NO DISCREPANCIES FOUND. RUN ENGINES 1 AND 2 ABOVE IDLE AND NAI ON. IAW B767 AMM 77-00-00. UNABLE TO DUPLICATE DISCREPANCIES AT THIS TIME, OPS CHECK NORMAL, PARAMETERS WITHIN LIMITS.