As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING ASA T/C 78273000 "INTERROGATE THE FMC CDU FOR ENGINE FAULTS", FOUND "SHORT TIME FAULT" MESSAGE 75-10452 "THE VBV POSITION SIGNALS DISAGREE" ON FLIGHT LEGS 1 AND 5, ON THE #2 ENGINE. GROUNDED - YES. REMOVED J10 HARNESS REF B737-900 AMM 73-21-06. REMOVED J9 HARNESS REF AMM 73-21-06 INSTALLED J9 HARNESS REF AMM 73-21-06-420-004-F00. INSTALLED J10 HARNESS REF AMM 73-21-06-400-802-F00. FADEC SYSTEM TEST PASSED. NO OTHER DEFECTS FOUND.