Ideally the red should be 255, which it is in your original pic, but since the other colors are off, the red is more prominent. As you can see the "blue" on the first pic is at 230 which means the "yellows" are overtaking the blue (blue is complimentary to yellow). And because the green chanel is below 255, that means that the magenta is overtaking the green (green is complimentary to magenta). The ideal situation is to have all colors equal 255. That will ensure a neutral image with no color casts.
PS: There are a couple of books on the market that have been invaluable to me regarding this subject. If you want to fine tune things, you might check them out.
Photoshop - Restoration & Retcouhing by Katrin Eismann
Adobe Photoshop 7 for Photographers by Martin Evening
They are damn expensive books but worth it if your serious about your craft.
d*