Look for obvious large cracks in the limbs or separating laminations. If none, string it up using a bow stringer. The string length you'll need is usually about 4" shorter than your AMO bow length. A 52" bow should take a 48" string. After you string it up, sight along the length of the string. The string shouldlay along the centerline of both limbs. If it doesn't, that limb is probably twisted. I've heard that you can straighten a twisted limb using heat and gentle pressure applied to the limb, but I've never tried it. There are those who may have. You've got a place to start here.