As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT VALVE CAUTION LIGHT ON WING ANTIICE PERFORMED FIM 30-11 TASK 808. OPERATED VALVE FROM COCKPIT AND OBSERVED LEFT WING ANTI-ICE VALVE MOVING AS SWITCH WAS OPENED AND CLOSED FROM COCKPIT. SUSPECTED MOISTURE WAS IN SENSE LINE IN VALVE. ONCE VALVE WAS WARMED UP. VALVE OPERATED CORRECTLY.