As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT TOP OF DESCENT FL380 SELECTED ENGINE ANTI ICE ON THE NR 1 COWL VALVE OPEN LIGHT REMAINED BRIGHT WITH AMBER TAI INDICATION ON THE ENGINE INSTRUMENT DISPLAY, QRC PROCEDURE COMPLETED COWL VALVE DID FINALLY OPEN JUST PRIOR TO ENGINE SHUTDOWN, NORMAL INDICATION. REMOVED AND REPLACED NR 1 COWL TAI VALVE REF 30 21 11, OPS CHECK GOOD REF SAME.