I think it *could* be fixed by milling the damaged area off very neatly and replacing it with a steel piece that matches the original contour attached with small dowels and flat head screws. You would probably have to mill it back about an inch or so to give you enough area to attach the fasteners without weakening the existing part too much.
I'd give it a try if I still had a machine shop at my disposal.
Somebody out there has probably repaired one in a similar fashion.
