Problem with Nintendo DS Lite's D-pad!

Sorry if I posted in the wrong place, but does anyone know how to fix a nintendo ds lite's d-pad? I've had this DS for 2 years now, and lately, the D-Pad buttons stopped making that "click" sound every time you press down on it. My Up and Down buttons work fine, but my Left and Right ones don't have that "click" anymore. Every time I press Left or Right, I have to press it down really hard and the buttons feel like there is no longer anything under it to support it. Its completely jammed. How do I fix this problem?

Either take it apart, starting from the back and see what is wrong and put it back together
Or take it to gamestop (Recommended)

Most likely worn out pads or you broke it. Those DS Lites weren't built well. I prefer the original personally.

Replying to #3

umm, i have a nintendo ds lite for 5 years now and everything is perfectly fine with it, and im a pretty hardcore gamer.