As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT WING ANTI-ICE VALVE CAUTION. IN-FLIGHT. GROUNDED - YES. PERFORMED OPS TEST PER B737-9 AMM 30-11-11-710-801,OPS CHECK GOOD BUT DUE TO HISTORY MX CONTROL REQUEST ANTI-ICE VALVE CHANGE. REMOVED AND REPLACED R/H WING THERMAL ANTI-ICE VALVE REF TO AMM 30-11-11-400-801 OPS CK GOOD.