This is why I said, "A hidden part, installed within spec, but not to the liking of the customer".
Thing is, parts that are installed on any device (car, hair dryer, bass, etc.) for functional, rather than cosmetic purposes need to meet two criteria:
1. Function within spec.
2. Perform that function within certain reliability specs.
Have you ever stripped linoleum from a floor on an old house thinking you are going to find "awesome, aged old oak" only to find dissimilar sections of floor of pine and other less attractive wood? The only reason you found it was because you wanted to modify something. The floor was sturdy enough and the lenoleum had an adequate sub-flooring. You can strip the lenoleum and replace with something else if you want to, of course, but it is unreasonable to believe that the subflooring is somehow "defective" because it doesn't look nice.
And in this case, we are talking solely about what the installation of a non-cosmetic part LOOKS LIKE. It performs just fine according to the OP's own comments.
This is actually absurdly black and white.