Exactly. That part was very clean and smooth except for that weird vice-grip mark on the bottom- only they know what they were doing...I missed that one, but it would still show some major marks if the chain hit it.
And a big +1 for J-B Weld. I have seen dirt bikes with radiator fill neck broken clean off, then J-B Welded back on and zero problems. I suspect a radiator fill neck will see a lot higher pressures that the case would ever see. Plus J-B Weld has been the go to fix for dirt bike case cracks, punctures and major holes for years. You will find lots of Adventure Riders carry J-B Weld (or similar) as part of their tool kits.
As for JB Weld, it always lives in my tool kit too- never had to do major repairs with it though. Guess if all does not go well, that's the first thing I am going to try.
Thanks all. Tomorrow is end of week for Yamaha so I am hoping I get a call back so I know how to proceed...