If he makes the motion for early release, he would need to do so in CA. Was he given permission to relocate to PA? If not, his relocating without permission might jeopardize his chances of release.
Disclaimer: I am not offering legal advice, assume I do not know the law in your state and that I am just making suggestions for starting points for when you do speak with an attorney. Do NOT rely on anything I write and contact a lawyer in your area immediately after reading my posting.