As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WING ANTI-ICE "L VALVE" CAUTION LIGHT ILLUMINATED WHEN SELECTING WING ANTI-ICE ON. GROUNDED - YES. REMOVED AND REPLACED "L VALVE" ON #1 ENG ANTI ICE VALVE PER B737-9 AMM 30-11-11-000-801 AND 30-11-11-400-801. OPS CHECK GOOD PER AMMM 30-11-11-11-710-801.