I have 2 WD3200AAKS drives, one of there PCB controller boards were destroyed when I accidently plugged the SATA power string into a PCI-E power output on my modular PSU by accident, the other drive is fine as it was on another string. Can I swap the PCB boards from one to the other and atleast pull the data off before RMAing it?

You can always try it and see if it will work. Often time, 3200AAKS drives, the PCB swap won't work but I have seen a very few cases that they worked fine. If that didn't work, then you need to seek a pro...

Could the swap damage the working PCB?

yes, and can break the 2 warranty as well, it depends on the distributor, who sold them.

Janos

Quick update,

swapped the logic boards the drive spun up windows could see everything, but all files showed 0 bytes. I was able to image the drive and restore it with no issues and am now able to read all my data!!

Thanks everyone for the help. Wonder if wd will take the Rma on the drive.