There is a guy here in Vancouver who repairs Lambo cases. When the owner cracks thier engine/trans a re & re at the Lambo dealer is several thousand$. He welds them up in place, on the car. One of the few who can, and he makes a couple grand every time he does one.
Unlikely you will find someone of his caliber but once removed and cleaned (very, very well) a good welder should be able to repair it. certainly worth the effort.