As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3118 - DURING CLIMB-OUT OF DTW, THE LEFT AIR VALVE CAUTION LIGHT ILLUMINATED. CREW CYCLED POWER AND CIRCUIT BREAKERS. UNABLE TO EXTINGUISH FAULT LIGHT. FLIGHT RETURNED TO DTW. MAINTENANCE REMOVED AND REPLACED LEFT BLEED VALVE. OPS CHECK GOOD. (M)