As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE VIBRATION INDICATOR BLANK. ACFT GROUNDED. PERFORMED AAVM SYSTEM TEST IAW AMM 77-31-00. FOUND FLIGHT HISTORY FAULTING ENG 1 TACH LEGS 1-25. REPLACED NR 1 ENGINE N2 TACH SENSOR IAW AMM 77-11-02. OPS AND LEAK CHECKED GOOD. GROUND VERIFICATION SUCCESSFUL IAW AMM 77-31-00. NO FAULTS NOTED.