As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IDLE POWER DESCENT, TRAFFIC PATTERN. AFTER POWER UP TO ENTER DOWNWIND, MASTER CAUTION, ANTI-ICE ILLUMINATED ALONG WITH NR 1 ENGINE AMBER COWL ANTI-ICE ANNUNCIATOR. M/C & AMBER COWL ANTI-ICE FLICKERED AT LOW POWER. REMAINED ON CONTINUOUSLY AT APPROACH POWER SETTINGS AND DURING TAXI IN. ACFT GROUNDED. ACCOMPLISHED OPS CHECK IAW AMM 30-21-00. ENGINE ANTI-ICE OPS CHECK GOOD. TSR ISSUED. REPLACED NR 1 ENGINE COWL ANTI-ICE VALVE IAW AMM 30-21-11. OPS TEST GOOD.