As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT, SELECTED ENGINE ICE ON NR 1 ENGINE BLUE "COWL VALVE OPEN" LIGHT ILLUMINATED BRIGHT BLUE. NEVER DID GO DIM, CYCLED SEVERAL TIMES. DID HAVE GREEN "TAI' ON ENGINE DISPLAY. POWER WAS AT IDLE & JUST ABOVE. ACFT GROUNDED. PERFORMED FIM TASK 30-21, TASK 805. DETERMINED NR 1 ENGINE COWL TAI VALVE DEFECTIVE. REPLACED NR 1 ENGINE COWL TAI VALVE, REF MM 30-21-11-000-801 AND MM 30-21-11-400-801. POST INSTALLATION OPS CHECK IS COMPLETE, NO DEFECTS NOTED.