As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3451 - LEFT AIR VALVE LIGHT CAME ON IN FLIGHT. RAN AIR VALVE LIGHT ON CHECKLIST, COULD NOT EXTINGUISH. MAINTENANCE REMOVED AND REPLACED THE LEFT AIR ANTI-ICE START BLEED VALVE IAW GE MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)