Besides soldering the RAM itself is that a few config lines need to change (based on the schematic and my RAM, both Hynix brand 1866mhz):

RAMCFG0 H -> L

RAMCFG1 L -> H

That means the following resistors need to change

R1611 moves to R1635 (100k)

R2052 moves to R2053 (10k) 

The components can be located using the .BRD file and the utility Openboardview.org 

moves to 

And then

moves to

So this issue is mainly finding the right resistors and pads.