As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT BETWEEN 18000 AND 12000 THE NR 1 ENGINE FUEL SPAR VALVE CLOSED LIGHT ILLUMINATED BRIGHT AND REMAINED ON FOR DURATION OF FLIGHT. NO OTHER NEGATIVE INDICATION WITH NR1 NOTED. LIGHT WENT DIM ON NR1 START LEVER CUTOFF. GROUNDED YES. PERFORMED FIM TASK 78-22-00-810-809. DETERMINED FAULT TO BE INTERMITTENT. REPLACED LT WING SPAR VALVE AS PRECAUTION REF MM 28-22-11. OPS NORMAL. VERIFICATION FLIGHT SUCCESSFUL.