As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ASA T/C 78273000, FOUND ENG #1 SHORT TIME FAULT CODE 75-20451 THE VBV POSITION SIGNALS DISAGREE. GROUNDED - YES. REMOVED AND REPLACED #1 ENG LH VBV, OPS/LEAK CHECK GOOD REF B737-900 AMM 75-32-02. ORIGINAL SUBMISSION DATE: 11/30/2022