What was found
NR 1 ENGINE SHOWS MESSAGES 75-10601 (TBV POSITION SIGNALS DISAGREE) SHORT TIME FAULT, 75-10591 (TBV POSITION SIGNALS DISAGREE) LONG TIME FAULT, AND 75-20601 (TBV POSITION SIGNALS DISAGREE), SHORT TIME FAULT. ACFT GROUNDED. REMOVED AND REPLACED THE NR 1 ENGINE J5 AND J9 HARNESSES IAW AMM 73-21-06. EEC TEST FOR NR 1 ENGINE TESTS GOOD IAW AMM 73-21-00-700-804-F00. TEST R-ACTUATORS TEST FOR NR 1 ENGINE TESTS GOOD IAW AMM 71-00-00-700-807-F00. NR 1 ENGINE FADER SYSTEM TEST CHECKS GOOD IAW AMM 73-21-00-700-802-F00. NR 1 ENGINE IDENT/6NFIG OPS CHECKS GOOD IAW AMM 73-21-00-700-808-F00. NR 1 ENGINE EEL DISCRETE TEST CHECKED GOOD IAW AMM 73-21-00-700-809-F00. FOLLOWING NR 1 ENGINE RUN, FLIGHT LEG O+1 SHOWS NO CURRENT FAULTS. ALL TESTS PASSED.