NA Localization:
It's a Conscience Circuit...nay, a Heart Circuit.
It's located right next to her power reactor, and it's the final piece that fits within the empty space of her heart.
The mechanical heart sparkles.
It's superfluous to her design.
Something that was lost from her former self.
It's a crystallization of the bond with her pilot...but now its radiance cannot and should not be pursued.
Even if the part is an afterthought, it's still something very special.
"Hmmmm, well if you insist, I could sing for just a bit. One song? Oh, no way. It'll only be one album. Do you have a problem with that?"
Fan Translation:
It is not a conscience circuit, but a 'human heart' circuit.
Right beside her nuclear reactor, what lies in the empty space of her heart: the final part.
The mechanical heart casts a glimmering sheen.
It is something unnecessary for her.
What was lost from when she was she.
To show her dreams of the 'radiance' she knew she could no longer long for, the crystallization of her bond with her pilot.
Even if it is a part added as an afterthought,
it is something truly precious.
"... Very well. If you're going to be so persistent, I wouldn't mind singing just a little.
A song? No, perish the thought.
I'm only going to sing an album, is that a problem?"