As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND SHORT TIME FAULT ON #1 ENG. MSG #75-30451 THE VBV POSITION SIGNALS DISAGREE. DEFERRED PER T/C 78273000. GROUNDED - YES. REMOVED AND REPLACED LEFT VBV ACTUATOR ON #1 ENGINE. IAW B737-900 AMM 75-32-02-400-801-F00. IDLE POWER LEAK CHECK, TASK 71-00-00-700-807-F00. ACTUATOR TEST TASK 71-00-00-700-807-F00. NO LEAK FOUND. OPS CHECK GOOD. RETURN AIRCRAFT TO NORMAL CONFIGURATION.