If you need to swap the PCB, then you will most likely need to transfer unique "adaptive" data from patient to donor. In your case these data are embedded within the Marvell MCU, which makes DIY a very difficult proposition.
Be careful of those unscrupulous suppliers who will gladly sell you a board and then try to upsell you a "data recovery" service when the board fails to work (even though the board may be good).
I just saw a thread at Tom's Hardware where a user was able to swap a similar PCB without transferring the flash memory. The data recovery professionals don't seem to be able to agree when such transfers are required for Samsung drives (some drives need them while others don't). In fact donordrives.com doesn't spell out the requirements, either.
Anyway, if all you need is a 4R7 coil, then you should be able to obtain one from places like Mouser, Digikey, or Farnell.
This PCB's BIOS is integrated on the Main Controller IC. You should exchange the Main Controller IC to let the HDD be recognized. Move the Main Controller IC(the biggest chip on the board) is a complex job which need you have certain techique. Some electronics repair shop can do it.
