Hey Kenneth,
Here’s the answer to the same question on another thread:
@mayer:
You might do best by contacting Apple and see if they will do a "Flat Rate repair". 1-800-MYAPPLE. Cost on a board this new are going to extremely high, if you can even find one. Here's a couple at PowerBook Medic priced at $1200 & $1400: [https://www.powerbookmedic.com/parts/661-06279/Logic-Board-27GHz-i7-512GB-16GB-455.html|https://www.powerbookmedic.com/parts/661-06279/Logic-Board-27GHz-i7-512GB-16GB-455.html]