As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 39000FT NR 1 ENG ANTI ICE VALVE (LEFT ENG) STAYED BRIGHT BLUE FOR 20SEC THEN WENT DIM. OAI 63 C, POSSIBLE COLD TEMP STUCK VALVE RELATED. GROUND VERIFIED FAULT TAI VALVE STICKING. VALVE ASSY COWL THRM ANTI ICE P/N VERIFIED BY SEAMC. REMOVED VALVE REF MM 30 21 11 000 801. INSTALLED VALVE REF MM 30 21 11 400 801. GROUND VERIFIED TAI VALVE, OPS CHECKS REF MM 30 21 11 400 801, LEAK CHKS GOOD. SEAMC NOTIFIED.