I lost my old 3ds some time ago and have recently replaced it, only to find out that your Nintendo network id is linked to the console and not the account. I know you can recover it by phoning but you need the original serial ID
I did some googling and found out that it was stored in a club Nintendo account, but that website has been shut down is there anyway to find your serial ID online, or get Nintendo to unlink the account without the use of the serial ID?

HAY LAM...!