What was found
ON CLIMBOUT 2000 FT START VALVE LIGHT ILLUMINATED AT CLIMB THRUST APPROX 90 PERCENT N1. CYCLED START VALVE C/B'S, NO HELP. SHUT DOWN ENGINE PER QRH, OVERWEIGHT LANDING DONE VERY SMOOTHLY THOUGH COMPLETED ER 2-80-10-03. SWAPPED START VALVE OPEN INDICATION WIRE TO SPARE, RAN ENGINE TWICE, OPS GOOD.