What was found
NR 1 ENGINE LAGS BEHIND NR 2 ENGINE DURING INCREASE AND DECREASE IN POWER SETTING. WITH 10% N1 CHANGE NR 1 ENGINE WOULD TAKE 4-5 SECONDS TO REACH SAME POWER SETTING AS NR 2 N1. THIS OCCURRED DURING DESCENT FROM FL 360 INCLUDING LEVEL OFF AND CONTINUED DURING TAXI. GROUNDED - YES. PERFORMED EEC BITE, EEC TEST PASSED NO CURRENT OR RECENT FAULTS. PERFORMED FIM 73-05 TASK 814 AND 816 INSPECTED PS3 LINE NO LOOSE CONNECTION OR DAMAGE NOTED. EEC INPUT MONITORING FMV, TRA, N1, AND N2 DESCRETE ALL SIGNALS NORMAL. PERFORMED TEST 8 ACCELERATION CHECK ALL TEST PASS. GROUND VERIFICATION PASS AIRCRAFT OK FOR SERVICE.