As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L VALVE WING ANTI-ICE AMBER STAYED ON WHEN TURNED ON VALVE STUCK CLOSED. L VALVE LIGHT WENT OUT WHEN SWITCH TURNED OFF. GROUNDED - YES. REMOVED AND REPLACED LH WING ANTI-ICE VALVE REF B737-9 AMM 30-11-11. (REF TSR713612 ON W/O 1936784)