As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE START VALVE LIGHT CAME ON DURING ENGINE START WHEN THE START VALVE WAS MANUALLY OPEN AND THE START VALVE LIGHT WENT OUT WHEN THE START VALVE WAS MANUALLY CLOSED AFTER ENGINE START. DURING CLIMBOUT AFTER TAKEOFF, THE START VALVE LIGHT CAME ON STEADY AND REMAINED ON FOR THE DURATION OF THE FLIGHT. DIVERTED DUE TO KOWN ICING. R & R NR 1 ENGINE START VALVE.