For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
You use ASD, Apple Service Diagnostic. Example 3S148, 3S156, 3S158. Can be found on torrent and from there you need to do your own research as this is all of doubtful legality.