Hey guys,
I have just swap a Mid 2012 non retina logic board with the Early 2011 MBP. Works fine. The only glitch is the Automatic Graphic Switching seems not working. It always stay with High performance but not switch. I can even enter my original S/N into the Nvram with Set System Serial Number software. Anyway, my MBP is out of warranty and it is early 2011 model with AMD graphic went wrong by well know reason just after my Apple Care expired. So, DIY and works. I bought this logic board on Taobao and cost me US$560.00.
Charles