There's a good chance you can straighten the limbs. Just grab a limb where it's offline and twist it in the other direction, twisting a little past center to allow for spring back. String the bow, draw it and let it down gently to see if the string is tracking where it should. Repeat as necessary. Some people do the twisting with the bow strung. You can also use heat to warm the limbs in the affected area before twisting them back into position. A hair dryer works well for this. It's not a good idea to hold the limbs over steam or immerse them in hot water. If the finish is cracked anywhere, water will get in and swell the wood starting a delamination process. Dry heat is the way to go,but don't overheat the bow. If you get the bow hotter than the temperature at which it was glued up, it could delaminate. Delamination is always a danger, but I've straightened a lot of limbs on older bows and haven't had one delaminate yet. Good luck.