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.
Of course it is possible and I've done it. But not on a 820-2375 and some stupid "upgrade" ideas some people have. Also RAM very rarely fails, usually corrosion under CPU/RAM.