When it comes to warranty with SRAM it is best to head to your LBS. SRAM really only deals directly with shops. Regardless: They really do have a good warranty program should issues occur. I had One of my Force levers replaced when it snapped.

The breaking of the component, as I have been told, is just due to a defective part near the bushing for the shifter paddle. If there is a problem with it then the stress of shifting will eventually cause the metal to fatigue and break.