Agree with above. I trued my new Campag Vento rear wheel which came from the factory with 1-2mm of lateral runnout. It has stayed true since. Best advice I can provide is always start with loosening the spokes on the side of the wheel opposite the direction you want the wheel to move...by no more than 1/4 turn and record the spokes you change. A slight tweak and you can normally bring the wheel right in. If you label the spokes you change you can always restore the wheel to its original shape if you get lost.
Good Luck,
George