I bought an ipad air at Target with giftcard on Black Friday. The screen has yellow tint on top left area, and the speaker is kind of hoarse. I would like to replace for a new unit at Apple store(I guess Target ones are from the same batch), but I suspect the new one would have similar issues. In case I got bad ones again I would like to just return it and get refund. The question is: if I got exchanged at Apple store, can I still return it to Target? the S/N would be differenct, would they accept it? Thanks.