It is not just one computer that can be at fault, that's why you need the codes read at a reputable shop.
Removal of the instrument cluster is fairly easy, check you tube for a 2004 XC70.
The CEM: http://xemodex.com/blog/central-electronic-module-removal-instructions-for-volvo-1999-2004
Note: You cannot drive the car while the CEM or DIM has been removed. The battery must be disconnected for the duration. If you need to lock the car, you will need to manually lock all of the doors and use a key to lock the driver's door.
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My back feels better when I sit in a Volvo seat
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