As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF T/C 78273000, #1 ENG FAULT MSGS 75-30401 (THE VSV POSITION SIGNALS DISAGREE), 75-10391 (THE VSV POSITION SIGNAL IS OUT OF RANGE), 75-10401 VSV POSITION SIGNALS DISAGREE AND 75-20401 (VSV POSITION SIGNALS DISAGREE) GROUNDED - YES. REPLACED ENGINE 1 EEC. ACCOMPLISHED FADEC SYSYTEM TEST, ALL TESTS PASS REF B737-900 AMM 73-21-60-400-801-F00. REPAIR CONFIRMATION, ACTUATORS TEST 12 PASSES REF B737-900 FIM 75-31 TASK 804 AND FIM 75-31 TASK 803. GROUND VERIFICATION SUCCESSFUL.