As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
# 2 ENGINE ANTI ICE COWL VALVE STUCK CLOSED AMBER TAI & BRIGHT BLUE LIGHT. GROUNDED - YES. REMOVED AND REPLACED #2 ENG COWL TAI VALVE ASSY IAW B737-800 AMM 30-21-11/401. PERFORMED ENGINE COWL TAI VALVE INSTALLATION TEST REF AMM SUBTASK 30-21-11-860-009, LEAK CHECK AND OPS CHECK SUCCESSFUL, OK FOR SERVICE.