As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT, AT 10,000 FT, THE BLUE NR 2 "COWL VALVE OPEN" LIGHT ILLUMINATED WITH THE NR 2 ENGINE ANTI-ICE SWITCH IN THE OFF POSITION. THE LIGHT APPEARED TO FLICKER AND ILLUMINATE STEADY. REMAINED FOR ABOUT 3 MINS WITH AND WITHOUT POWER FROM NR 2 ENGINE. ACFT GROUNDED. REPLACED NR 2 ENG THERMAL ANTI ICE VALVE REF AMM 30-21-11. NO LEAKS NOTED AND OPS CHECK GOOD.