The Sensex at the Bombay Stock Exchange was trading 56 points in positive territory at 17,024 when reports last came in. The 30-share barometer, which had gained 86 points in the previous two sessions, gained 42 points, to 17,010 in early trade today with power, metals and consumer durables sector stocks leading the rise.The Nifty at the National Stock Exchange moved up by 15 points, to 5,157.