As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CDU ENGINE FAULT, FOUND THE NR 1 ENGINE HAS LONG TERM FAULT 75-10391 VSV POSITION SIGNAL IS OUT OF RANGE. ACFT GROUNDED. REMOVED RT VSV ACTUATOR, REF AMM 75-31-01. INSTALLED RT VSV ACTUATOR ON NR 1 ENGINE, REF AMM 75-31-01-400-802-F00. OPS & LEAK CHECKS OK.