Calling My Creator

Dear Sir,
I have a missing part, you see
Lateral of my iron sternum.
Yes, on the left that’s right you’ve got it
Inferior to my steel ribcage
Superior to my vibrant circuitry.

Dear Sir,
What is this void you’ve left?
Current pulsates but I feel nothing.
Packaging empty Sir, naught to replace
Dear man I need to feel the beat
Or else I am NOT LIVING.