As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
D: PHX - AIR TURNBACK - NR 1 START VALVE LIGHT ILLUMINATED IN FLIGHT AT 250 KTS. 18000 FEET; WENT THROUGH QRH AND SHUTDOWN THE ENGINE; START VALVE OPEN LIGHT EXTINGUISHED WHEN THE ENGINE WAS SHUT DOWN. REMOVED AND REPLACED THE START VALVE; DURING START VALVE REPLACEMENT FOUND WIRE CHAFED AT THE PRESSURE SWITCH CONNECTION; THE WIRE WAS REPAIRED AND FUNCTIONAL CHECKS WERE GOOD.