What was found
AFTER TAKEOFF, DUCT OVERHEAT LIGHT ILLUM FOLLOW BY ZONE 4 MAIN CARGO SMOKE WARN LIGHT AND BELL. SMELL SMOKE IN COCKPIT LIGHTS AND BELL EXTINGUISH THEN CAME ON ANOTHER. THE NR 3 ENG DUCT TEMP WAS 220 DEG NR 1 ENG WAS APPROX 180. OPER CKD WING ANTI-ICE SYS, ALL SYS ALL INDICATION NORMAL. REMOVED AND REPLACED NR 3 RIGHT HAND WING ANTI ICE SHUTOFF VALVE PER M/M 30-11-31 (PRECAUTIONARY). LEAK CHECK GOOD. REMOVED AND REPLACED WING ANTI-ICE HIGH PRESS SHUTOFF VALVE PER M/M 30-11-11 OPER CK GOOD. RAN ENG 1 AND 3 TO PERFORM A FUNCTIONAL TEST OF WING THERMAL ANTI-ICE SYS PER M/M 30-13-0, ALL CHECKS GOOD.