What was found
NR 2 ENGINE ACMS DATA SHOWS INTERMITTENT N2 VALUES FROM OIP REPORT. ACFT GROUNDED. REF FIM 77-31, TASK 805, 1ST LISTED CAUSE FOR N2 TACH LOSS FAULT IS N2 SENSOR. R & R NR 2 ENG, N2 SENSOR AND OPS & LEAK TEST GOOD IAW AMM 77-11-02. AVM SHOWS "NO MAINT MSGS" BUT FAULT HISTORY 0 STILL SHOWS NR 2, N2 TACH LOSS FAULT AFTER POST SENSOR REPLACEMENT ENGINE RUN. GROUND VERIFICATION SUCCESSFUL IAW N2 SENSOR REMOVAL/INSTALLATION TASKS. ACCOMPLISHED FIM 77-31, TASK 805, IAW FIM STEP E1, PERFORMED CDS BITE IAW FIM 31-62, TASK 801, BOTH SHOW NO N2 RPM FAULTS FOR LAST 10 LEGS. NR 2 ENGINE EEC BITE IAW MM 73-21-00-740-801-F00 ALSO SHOWS NO FAULTS FOR LAST 10 LEGS. REMOVED AAVM IAW MM 77-31-03-000-801-F00. PERFORMED WIRING CHECK IAW FIM STEP E. 3 NO DEFECTS NOTED. REINSTALLED AND TESTED AAVM IAW MM 77-31-03-400-801-F00. OPS NORMAL. CLEARED AAVM FAULT MEMORY IAW MM 77-31-00-970-803-F00 AND PERFORMED REPAIR CONFIRMATION IAW FIM 77-31, TASK 805, AAVM BITE IAW FIM 77-31, TASK 801 NOW SHOWS NO FAULTS LOGGED.