What was found
DURING CLIMBOUT OF FLIGHT 3169, ENGINE WAS SELECTED, AIR VALVE LIGHT ILLUMINATED AFTER 3-5 SECONDS QRH COMPLETED, VALVE RESET ITSELF. SECOND TIME ANTI-ICE SWITCHED ON. AIR VALVE ON AGAIN AND STAYED ON AFTER QRH COMPLETED. AIR RETURN TO DTW. MAINTENANCE REPLACED LT ENGINE ANTI-ICE VALVE, REPLACED LT ENGINE GREEN WIRING HARNESS, REPLACED LT ENGINE CHIP DETECTOR. PERFORMED REQUIRED OPS/LEAK CHECKS. ALL CHECKS GOOD. ALL REF GE MM.