does it fail to "click"? or does it not return to it's original position: i doubt your l button is actually broke, there just might be some dust or sand grains jammed underneath the buttons
http://www.flickr.com/photos/6264776...7594277451148/
you could take a look at this case replacement guide and see if anything interesting shows up, or you could move to america
btw, why would your warrenty be void?
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