Can I change the light bulbs of the instrument cluster of my 03 GMC Sierra?

You can find instructions for removal, and what fails on this instrument panel on this site: http://bit.ly/8z7rcm Go to the Instrument cluster section and find your model.

Yes you can, they are soldered to the circuit board though. This is very common on the 03-06 GMs. You can get it repaired here - www.drspeedometer.com