Chevy Suburban is making a chirping noise!?

[Canuck gone south]

I need some help diagnosing the problem! In my wildest dreams I am a mechanic, but for now I just stick to the basics of oil change, belt change, filter change... so if it is not one of those things I am stuck! I had my break pads replaced very recently, but the noise is different. To me it sounds like a belt, but my serpentine is in great shape. Any suggestions?