As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PER T/C 78273000 INTERROGATE THE FMC CDU FOR ENGINE FAULTS. FOUND THE FAULT CODE; 75-10592, THE TBV POSITION SIGNAL IS OUT OF RANGE. THE FAULT IS LONG TIME FAULT. GROUNDED - YES. REMOVED AND REPLACED J9 HARNESS REF B737-900 AMM 73-21-06-000/400-802-F00. ALL TESTS PASS FAULT NO LONGER EXISTS.