As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENG ANTI-ICE VALVE DISAGREEMENT LIGHT CAME ON DESPITE REPEATED ATTEMPTS AT DIFFERENT POWER SETTINGS. GROUNDED - YES. PERFORMED B737-800 FIM 30-21 TASK 805 FOUND ENG ANTI ICE VALVE TO BE BAD. REMOVED AND REPLACED #2 ENGINE ANTI ICE VALVE REF B737-800 AMM 30-21-11 OPS CHECK & LEAK CHECK GOOD.