Originally Posted by Snoopy

If I understand your question.....

Making hundreds of thousands of an individual part someone is compelled to have a A defective part. Hopefully and generally, when the part is replaced, the new replacement is NOT defective. Sometimes, like the ignition module replacement, it is a redesigned part...that is the replacement.

Does this answer your question? Or are you asking about the GM/Chev. internal procedural replacement?