When an airframe is stressed beyond its design limits it can't be put back into service. It's conceivable that it could be put through a "C-check" type process

When an airframe is stressed beyond its design limits it can't be put back into service. It's conceivable that it could be put through a "C-check" type process of disassembly and inspection, but given the age and residual value of the plane that might not have been cost effective.