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Key documents from them and say a gm engineer lied in a sworn deposition. >> we did the design release engineer for the ignition switch in the 05 cobalt. >> yes, i was. >> reporter: the meltons attorney gave him part of the dep shooigs denied approving any changes to the ignition switch. >> there was never a work order that i saw hot lining this. >> any such change was made, if was made without your knowledge and authorization? >> that is correct. >> reporter: but in 2006, digiorgio signed this ...