In addition to your the previous input, it would depend on the type of nonconformity. For example, after googling examples. I became aware that that there are three types of nonconformities: minor, major, and critical.

Minor nonconformity would be when the durability, interchangeability, reliability, maintainability, or effective use of a product are not adversely effected. And if there are two many minor nonconformities than it would result in a critical or major nonconformity.

Major nonconformity results in failure or reduced usability of the product of the intended purpose.

Critical nonconformity results in hazardous or unsafe conditions individuals using it.

And when you see the types of nonnconformities, it actually gives us an idea of how well regulated the project itself was. If its a critical type, then research and development did not do a great job and the product can be brought back to them. And this would also raise legal issues if this product was to go on market. So if you are able to determine if the nonconformity is minor, major, or critical you will have a good idea of which phase or process to go back to.