As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL250, THE NR 1 ENGINE START VALVE OPEN LIGHT ILLUMINATED. CREW SHUT DOWN THE ENGINE AND RETURNED TO ANC WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 1 ENGINE START VALVE INDICATING SWITCH. EXACT PART CAUSING PROBLEM TO BE DETERMINED.