Can you let us in on your secret, ie which model do you have? 🙂
What did you do, if anything, to kill your drive?
Are there any burnt components on the PCB, for example the TVS diodes (D4 and D3)? If so, then there is often a very easy, no-cost, DIY fix.
Otherwise, if you really need to replace the PCB, and if you have a recent model WD drive, then you will need to transfer the 8-pin serial flash memory chip at location U12 from patient to donor. This chip stores unique, drive specific "adaptive" information. Some board suppliers include a firmware transfer or ROM transfer service for US$10 - $20. Otherwise, if you are not adept at soldering, your local TV/AV repair shop should be able to do it for you.
If you are unlucky and U12 is not populated, then this means that the adaptive data are internal to the Marvell MCU (big "M"). Reading these data requires specialised software tools. Otherwise the MCU can be transferred to the donor, but this in turn requires an smt rework station and some skill.
In short, no clean room is needed.