Hi sminky01,

I've checked the manual for this VAIO and could tell that only the memory module was mentioned to be up-gradable as shown on page 94 in the user manual in this link:

https://bit.ly/2N1VZaQ.

However, I'd recommend checking the possibility for replacing the CPU by contacting the service centre that deals with VAIO which is called Flextronics, and their number is 01925260090.

Hope this helps,

Almou_10