As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO DESCENT ENGINE ANTI-ICE TURNED ON AND OPERATED NORMALLY. WHEN THRUST REDUCED FOR DESCENT FROM FL 380, NR 2 ENG ANTI-ICE LT CAME ON BRIGHT BLUE. REMAINED ON UNTIL POWER ADVANCED AT 6,000 FT, THEN EXTINGUISHED FOR REST OF FLIGHT THROUGH LANDING. ACFT GROUNDED. REMOVED NR 2 ENG COWL TAI VALVE REF AMM 30-21-11-000-801. INSTALLED A NEW NR 2 ENG COWL TAI VALVE REF AMM 30-21-11-400-801. OPS CK GOOD REF, AMM 30-21-00-710-801.