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 CONTINUES TO SHOW INTERMITTENT N2 VALUES FROM OIP REPORT 7. TAKEOFF AND CRUISE ACMS REPORTS SHOW NORMAL PARAMETERS PRI: 1ETOPS SIGNIFICANT SYSTEM. ACFT GROUNDED. REPLACED NR 2 ENGINE, N2 SPEED SENSOR REF AMM 77-11-02. PERFORMED N2 SPEED SENSOR INSTALLATION TEST REF AMM 71-00-00-800-811-FOO, TEST 3A REF. AMM 71-00-00-700-801-F00 AND TEST 13 REF. AMM 71-00-00-700-808-F00. TEST PASSED. NO LEAKS NOTED. NO FAULTS NOTED.