Will Mercedes cover the repair of a Stress crack that developed on the rear cross member where the rear suspension mounts too? The crack is along a weld bead and now formed a gap causing the rear wheel to go grossly out of alignment. Vehicle is out of warranty (2003 with ~75k)

It’s strange why this even happened? No impact or any thing like that. Perhaps a week point in the architecture of the cross member. Is there a pervious in the warrant that will cover this even tough its out of the traditional warranty period?
Thanks,