What was found
DURING CLIMBOUT, ENGINE 1 START VALVE OPEN LIGHT ILLUMINATED. REMOVED PNEUMATIC SUPPLY FROM NR 1 MANIFOLD AND RETURNED TO OAK. ENGINE OPERATION APPEARED NORMAL. LIGHT REMAINED ON THROUGHOUT APPROACH AND LANDING. DUMPED FUEL TO LANDING WEIGHT OF 375,000. FOUND CHAFED WIRING 2ND CLAMP FROM VALVE. INSULATED WIRING AND REMOVED CANON PLUGS FROM VALVE. ALSO, FOUND MICRO SWITCH BAD ON VALVE. VALVE (P/N 397892-1).