What was found
NR 1 ENGINE ANTI-ICE COWL LIGHT AT FIRST INTERMITTENT THEN STEADY, BRIGHT BLUE WHEN ANTI-ICE SWITCH SELECTED ON. ACFT GROUNDED. PERFORMED 30-21, TASK 805. OPS CHECKED NR 1 ENGINE ANTI-ICE VALVE. OPEN, CLOSED, BRIGHT ANN LIGHT NUMEROUS TIMES, OPS NORMAL IAW FIM INTERMITTENT FAULT. CONSULTED SEAM C NR 1 ENGINE COWL TAI VALVE IS TO BE REPLACED. REPLACED ENGINE COWL ANTI ICE VALVE IAW AMM 30-21-11 IAW STEP, F, 1. PROVIDED SECONDARY TORQUE CHECK. VALVE REPLACED AS PRECAUTIONARY. VERIFICATION FLIGHT SATISFACTORY.