What was found
DURING CLIMB THROUGH 9000, COWL ANTI-ICE AND MASTER CAUTION LIGHTS ILLUMINATED ON THE NR 1 ENGINE. CYCLED ENGINE ANTI-ICE SWITCHES OFF. LIGHT EXTINGUISHED. ACCOMPLISHED QRH PROCEDURE, CLIMBING OUT OF 15000, TURNED ENGINE ANTI-ICE ON. OPERATED NORMAL. NO WARNING LIGHT. ACFT GROUNDED. INSPECTED NR 1 ENGINE COWL ANTI-ICE VALVE. NO DEFECTS FOUND. PERFORMED OPS CHECKED IAW AMM 30-21-11. OPS CHECK OK. NO PREVIOUS HISORY FOR 30 DAYS. GROUND VERIFICATION SUCCESSFUL.