My ST3400620AS was pulled from my system and I dusted it off knocking off a few transistors; clumsy me!

So I ordered a PCB replacement... both are a 100435196 Rev. A boards

What I have: ST3400620AS 400GB SATA 9BJ144-308 with Chip #: V520AA / FW: 3.AAK / Site Code:SU with a Date Code: 08237
What I got as a replacement: ST3400620AS 400GB SATA 9BJ144-308 with Chip #: V520AA / FW: 3.AAK / Site Code:TK with a Date Code: unknown

The system boots but after awhile trying to recover the data; the drive goes offline

Could this be due the wrong Date Code or Site Code... or is this a firmware issue. I am told that I could remove the BIOS off the old and replace it on the replacement board

Kindly open for suggestions

According to the following site, your model does not require a chip transfer:

http://www.donordrives.com/hard-drive-p ... swap-match
http://www.donordrives.com/blog/pcbswapguide

Your best DIY chance for recovering your data is to clone your drive, sector by sector, using a tool (eg ddrescue) that knows how to work around bad sectors, and then use data recovery software on the clone.

http://www.gnu.org/software/ddrescue/ddrescue.html (freeware)

Ddrescue can perform multipass cloning. It clones the easy sectors on the first pass, and attempts the more difficult ones on subsequent passes. It keeps a log, allowing it to resume after an interruption.

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A backup a day keeps DR away.