Nintendo right now can't repair the system because their engineers haven't received their units and parts yet so they don't know how it's assembled (they were even confused about getting the serial number by removing the faceplates) so the only option if they have any left would be to send the entire unit back and they send you a new one. Only problem with that is if you've done a transfer you lose all your stuff. :/
So it's either do that or wait till February or whenever the company that does Nintendo repairs receive their parts and have already disassembled some New 3DS systems
O_O what!?!? And you loose also all your e-shop games??? Gosh it's a total mess -.-