Warranty apparently void yes, but Nintendo along with Microsoft still take back modded consoles and repair them. 100's of people all over the world on other forums have tested this when they have damaged their console and they have sucessfully been repaired and returned.
true, but then they have the right to charge you. or they could also say no to you if they really wanted. Also think of the shipping costs to send it to get repaired. Hopefully if you are fitting a mod chip you know how to solder etc