What was found
NR 2 COWL VALVE OPEN LIGHT ILLUMINATED BRIGHT BLUE WITH ENGINE ANTI-ICE SELECTED ON. ASSOCIATED TAI AMBER LIGHT ILLUMINATED. LIGHT WENT OUT WITH ENGINE ANTI-ICE SELECTED OFF. ACFT GROUNDED. RAN ENGINE, AND FOUND NR 2 COWL VALVE NO TRANSITION "BRIGHT BLUE" WHEN SELECTED ON. NO AMBER LIGHT NOTED. NOTED SLOW RESPONSE TIME FOR INDICATION ON CDS SCREEN. REMOVED AND REPLACED NR 2 ENGINE COWL ANTI-ICE VALVE, STEPS A -H(5)(1). IAW AMM 30-21-11. COMPLETED NR 2 ENGINE TAI VALVE INSTALLED IAW AMM 30-20-11 STARTING AT 3H5C. BOND TEST GOOD. LEAK AND OPS TEST NR 2 ENGINE TAI VALVE GOOD.