Unity/blender help I am so lost!

I got all the way in the avatar making process to unity, I was putting on the finishing touches when I realized something horrible! A blender weight painting error was making my chest clip through the shirt! It was weighted to the spine instead. It’s the one thing I didn’t catch. Is there I way I can fix the issue on the model and put it back into unity without losing any progress?
Please help me I worked so hard on this I didn’t sleep :frowning:

I have since solved this!!