As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG NR 2, FAULT CODE 75-30452, THE VBV POSITION SIGNALS DISAGREE. SHORT TIME FAULT. DEFERRED PER TC 78273000. THIS FAULT HAS 30 DAY HISTORY, X2 PREVIOUS HITS. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 75-32 TASK 803. LEFT ACTUATOR READS OUT OF TOLERANCE. REPLACED THE LT VBV ACTUATOR ON THE NR 2 ENGINE PER B737-900 AMM 75-32-02. LK AND OPS CK GOOD. ETOPS GROUND VERIFICATION SUCCESSFUL, NO FAULTS.