What was found
JUST PRIOR TO TAKE OFF, NOTICED THE NR 2 ENGINE ANTI ICE BLUE LIGHT FLICKER DIM BLUE, CYCLED THE SWITCH ON AND OFF AND THE LIGHTS AND VALVES REACTED NORMALLY. WHEN THRUST LEVERS WENT TO IDLE ON DESCENT THE LIGHT WENT OUT, NO FLICKERING. ACFT GROUNDED. VERIFIED CONNECTOR TIGHT ON VALVE. PERFORMED ENGINE COWL ANTI-ICING OPS TEST REF AMM 30-21-00-710-801, NO HISTORY LAST 60 DAYS, OPS CHECK NORMAL.