As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENG MAINTENANCE FAULT CODE 75-20452, "THE VBV POSITION SIGNALS DISAGREE", SHORT TIME FAULT, FOUND WHILE PERFORMING T/C 78273000. GROUNDED - YES. REF ASA W/O 1927523, ASA T/C N8473000 AND ASA T/C N8473001 FOR REMOVAL AND INSTALLATION OF THE #2 ENG HMU. NO FAULTS AFTER INSTALLATION.