What was found
NR 1 ENGINE HAS SHORT TERM FAULT CODES 75-20401, VSV POSITION SIGNAL DISAGREE, 75-10401, VSV POSITION SIGNAL DISAGREE AND LONG TERM FAULT CODE 75-10391, VSV POSITION SIGNAL IS OUT OF RANGE. ACFT GROUNDED. ACCOMPLISHED NR 1 EEC BITE TEST DONE IAW FIM 73-00 TASK 801, NO FAULTS FOUND. CDU HISTORY SHOWS FAULTING ON MANY LEGS. CHANNEL A AND B VSV ACTUATORS WITHIN TOLERANCE, IAW FIM 75-31, TASK 803, STEP 7. J9 AND J10 WIRE HARNESSES INSPECTED, NO DAMAGE NOTED. DUE TO CHANNEL A AND B RECENT FAULTING HISTORY. REMOVED AND REPLACED THE NR 1 ENGINE EEC IAW AMM 73-21-60-000-801-F00 FOR REMOVAL AND AMM 73-21-60-400-801-F00 FOR INSTALLATION. ACCOMPLISHED TESTS OF FADEC SYSTEM IAW AMM 73-21-00-700-802-F00. OPS CHECKED GOOD.