As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE ANTI ICE NR 1 COWL VALVE OPEN LIGHT REMAIN BRIGHT BLUE. WHEN SELECTED TO ON. SELECTION AT FL260, BRIGHT BLUE, DURING DESCENT WENT DIM AT FL180. AT 10000 FT WENT BRIGHT AGAIN WHILE IN CLOUDS. REMAINED BRIGHT BLUE UNTIL LANDING. REPLACED NR 1 ENG TAI VALVE, LEAK AND OPS CHECKED GOOD IAW MM 30-21-11. VERIFIED THAT LIGHTS WORKED NORMALLY IAW MM 30-21-11.