As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR1 ENGINE ACMS DATA SHOWS INTERMITTENT N2 VALUES FROM OIP REPORT 7. TAKEOFF AND CRUISE ACMS REPORTS SHOW NORMAL PARAMETERS. ACFT GROUNDED. REPLACED NR 1 ENGINE N2 SPEED SENSOR IAW MM 77-11-02. TESTS GOOD IAW POWER PLANT TEST REF TABLE MM 71-00-00-800-811-F00, TESTS 13, 3A.