What was found
DURING CLIMB OUT, WITH ENGINE ANTI-ICE ON. RECEIVED A AMBER ANTI-ICE LIGHT ON NR 1 ENG. FOLLOWED QRH PROCEDURES AND REDUCED THRUST ON THE NR. 1 ENGINE AND THE LIGHT EXTINGUISHED WITH APPROXIMATELY A 5% REDUCTION IN N1. ADVANCED THRUST IN CLIMB OUT AND THE LIGHT STAYED EXTINGUISHED. WITH THE ENGINE ANT-ICE ON. ACFT GROUNDED. PERFORMED FIM TASK 30-21-809 FOUND #1 ENG COWL ANTI VALVE BAD. FOUND BAD REMOVED AND REPLACED IAW AMM 30-21-11 OPS CHECK GOOD, LEAK CHECK GOOD, OK FOR SERVICE.