As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE ANTI-ICE SWITCH 1 WHEN SWITCH MOVED TO ON THE COWL VALVE OPEN LIGHT STAYED BRIGHT AND TAI INDICATION ON UPPER DU WAS AMBER WHEN SWITCH MOVED TO OFF THE COWL VALVE OPEN LIGHT EXTINGUISHED. ACFT GROUNDED. R & R NR 1 ENGINE INLET COWL THERMAL ANTI-ICE VALVE IAW AMM 30-21-11. LEAK AND OPS CHECK GOOD. GROUND VERIFICATION GOOD.