As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE NR 1 ENGINE START VALVE OPEN LIGHT ILLIMINATED. CREW FOLLOWED COM PROCEDURE AND THEN DIVERTED TO BOS FOR MAINTENANCE. START VALVE WAS FOUND IN THE CLOSED POSITION WHEN AIRCRAFT ARRIVED BUT WAS CHANGED PRECAUTIONARY. START VALVE INDICATION WAS PLACED ON MEL AND THE AIRCRAFT RETURNED TO SERVICE. EXACT PART CAUSING PROBLEM TO BE DETERMINED.