As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STARTING ENGINE NR 1, RECEIVED THE FLASHING ENGINE START VALVE OPEN LIGHT. RETEST WITH MX PERSONNEL, GAVE US THE SAME RESULT. ACFT GROUNDED. RAN NR 1 ENGINE, FOUND FAULT TO BE INTERMITTENT. SUGGEST REPLACING NR 1 ENGINE START VALVE. AS A PRECAUTION REPLACED NR 1 START VALVE IAW MM 80-11-03. OPS CHECKED IAW SAME REF AND 71-00-00-700-809-F00.