As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND #1 ENG LONG TIME FAULT 75-10391 THE VSV POSITION SIGNAL IS OUT OF RANGE. GROUNDED - YES. PERFORMED B737-900 FIM 75-31 TASK 803 AND TASK 804 TROUBLESHOOTING FOR ACTUATOR AND HARNESS RESISTANCES. ALL VALUES WITHIN RANGE. EEC TEST PASSED REF B737-900 AMM 73-21-00-700-804-F00. PRECAUTIONARILY REPLACED THE #1 ENG R/H VSV ACTUATOR. LEAK AND OPS CHECK GOOD REF AMM 75-31-01/401.