What was found
LT AIR VALVE CAUTION LIGHT IS ON. QRH WAS COMPLETED. LIGHT IS STILL ON. AIR RETURN TO DTW. REMOVED AND REPLACED ENGINE ANTI-ICE AIR VALVE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
LT AIR VALVE CAUTION LIGHT IS ON. QRH WAS COMPLETED. LIGHT IS STILL ON. AIR RETURN TO DTW. REMOVED AND REPLACED ENGINE ANTI-ICE AIR VALVE.