As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCOMPLISHMENT OF T/C 78273000 NR 1 ENGINE HAS SHORT TIME FAULT MESSAGE 75-30401 THE VSV POSITION SIGNALS DISAGREE. GROUNDED-YES. REMOVED AND REPLACED NR 1 ENGINE LT VSV ACTUATOR, REF B737-800 AMM 75-31-01-400-801-F00/AMM 72-23-03-400-802-F00. LEAK & OPERATIONS CHECKED GOOD.