As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT MADE AN AIR TURN BACK TO DEN DUE TO A WARNING ON THE ELECTRONIC CENTRALIZED ACFT MONITORING SYS FOR 'WING ANTI-ICE LT AND RT VALVE OPEN'. MX REMOVED AND REPLACED THE LT WING ANTI-ICE VALVE AND PERFORMED AN OPS TEST IAW AMM 30-11-51-000-001, 30-11-51-400-001 AND 30-11-00-710-001. (NOTE: RT VALVE WAS PLACED ON MEL.) OPS CHECK WAS NORMAL AND ACFT WAS RETURNED TO SERVICE.