As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING TASK CARD 78273000 INTERROGATE THE FMC CDU FOR ENGINE FAULTS FOUND FAULT 75-30452 #2 ENGINE VBV POSITION SIGNALS DISAGREE SHORT TIME FAULT. GROUNDED - YES. ACCOMPLISHED VBV CHANNEL A & B WIRING CHECKS WITH NFF. REF B737-900 FIM 75-32 TASK 803. REMOVED AND REPLACED #2 ENGINE LEFT VBV ACTUATOR REF B737-900 AMM 75-32-02. GROUND VERIFICATION SUCCESSFUL. OPS TEST AND LEAK TEST GOOD.