If you can scan at your highest resolution with all automation turned off then scan again with the photo turned 180 degrees you might see a marked decrease in the size of the cracks after you do as follows:
In Photo shop rotate one copy and drag it onto the other one
use layer mode difference to line up the pictures (when everything is black they are lined up)
copy the background layer and adjust both layers till the picture looks its best
To repair/restore the photo use this
tutorial as a starting point