it sounds like you purchased the nx model, so I don't know if my settings will help you directly. I can tell you exactly what I did though.
I went through this guide first:http://www.avsforum.com/avs-vb/showthread.php?t=948496
following the pdf instructions.
After I got the regular menu settings to about as good as I could, I took a look at the service menu.
I don't have any fancy calibration equipment, if you did, or are planning on getting some, you may want to look at this guide http://www.curtpalme.com/forum/viewtopic.php?t=10457
I'm sure others could give you much better calibration information than I could, but I can only tell you what I've done.
as far as the factory menu (and keep in mind this is all done using the px model, but i'm guessing your menu is probably very similiar if not identical), press 1, 2, 3, 4, on the remote, then press down twice to navigate to the color temp setting, press right to access it. From here, depending on what color tone you have selected from the regular menu, will determine what initial settings you have. This also means you have 3 customizable presets you can adjust (Normal, Warm, and Cool) For me the normal setting has all the values set at 128 (min of 0 man of 255). so that's the one I used to adjust, because it was easier to set back if I needed to. I loaded up a fullscreen Red step scale image, and adjusted the R value (press down once, to select the R value, press right or left to then adjust the values) until I got the greatest range on the step scale. I then did the same thing with the R offset (press up and down to navigate to the other values, right and left to change them), this time it changed the opposite side of the step scale. I then repeated this process with a blue and green step scale image and adjusted the B and G (and their offsets) values respectively.
I know this is certainly not the most accurate way or method to calibrate a projector, but without equipment, it seemed to work out ok for me.