The front-left case bolt was a sawed off bolt, with silicone around it, just stuck to fill the hole. The threads were gone, with a cheesy, cheap insert deal stuck in there that it's own threads were junk. I dug out the old insert (took a long time, but it's not something you can really charge the guy for, it's just an unfortunate situation). I set up the case in the drill press, and carefully drilled it out for a new 5/16-18 Heli Coil. Installed it correctly, and it's fixed. Welding and machine work averted.