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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:
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