As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE ACMS DATA SHOWS INTERMITTENT N2 VALUES FROM OIP REPORT 7. TAKEOFF AND CRUISE ACMS REPORTS SHOW NORMAL PARAMETERS. ACFT GROUNDED. VERIFIED NR 2 ENGINE N2 TACH LOSS FAULTS LOGGED IN AAVM. REMOVED AND REPLACED NR 2 ENGINE N2 TACH SENSOR, IAW AMM 77-11-02, OPS CHECKED NORMAL.