Hello @oneplustwo ,
I was looking up some things, IFixIt has a motherboard replacement tutorial at the following link ; [guide|51921]
and you can find the part here.;
http://www.ebay.com/itm/OEM-UNLOCKED-ONEPLUS-2-TWO-A2005-REPLACEMENT-64GB-LOGIC-BOARD-MOTHERBOARD-/141884426906
I myself have never replaced the motherboard of a phone, but I believe it is possible. I wish you luck and please upload when you complete with an update if it worked. I would love to hear about this.
Thanks
Keegan Bourque