As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T/C #7827300 FOUND LONG TIME FAULT MESSAGE #75-20391 "THE VSV POSITION SIGNAL IS OUT OF RANGE." DEFERRED PER T/C #78273000 ON NR 1 ENG. GROUNDED - YES. REMOVED AND REPLACED THE NR 1 ENG LT VSV ACTUATOR, LEAK CHECK GOOD. ACTUATOR TEST PASS AND NO FAULTS FOUND AFTER RUN. REF AMM 75-31-01-000-801-F00 AND 75-31-01-400-801-F00. THIS CLEARS PLT DEFERRAL.