As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING T/C 78273000, NR 1 ENGINE HAS FAULT MSG 75-10391, THE VSV POSITION SIGNAL IS OUT OF RANGE. ACFT GROUNDED. R & R NR 1 ENGINE RT VSV ACTUATOR ASSY IAW AMM 75-31-01-00-802-F00 AND 75-31-01-400-800-F00. LEAK AND OPS CK GOOD.