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.
The problem can be on RAM chips, or CPU side.
If you have time to waste, reball RAM chips.
Consider first if worth the job.
You can end with completely dead board; ask client permission first.