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Here's what I've done and freed the most stuborn froze up bolts. If you can get a box end wrench on the bolt, take a center punch and punch the center of the bolt head. The get a pnuematic chipping hammer with a pointed tip, adjust the air so that your not at full throttle on the chipping hammer. Put the wrench on the bolt then put the tip of the chizzle point in the spot where you center punched the bolt head, put some tork on it and start pnuematic hammering. You can adjust the air pressure up as high as you can and still keep the tip of the chizzle point in place, this should allow you to break free the bolt, good luck