Replacement WD PCB 006-0A90439 is available on HDDZone.com. To swap Western Digital PCB with Board Number 006-0A90439, your should make sure the Board Number on your original pcb is 006-0A90439 too.
WD PCB 006-0A90439 Image:
WD PCB 006-0A90439
WD PCB 006-0A90439 Additional Images:
WD PCB 006-0A90439
WD PCB 006-0A90439 PCB Number
For most of the PCB boards, we also need to swap the BIOS Chip from your original PCB to the replacement PCB, in order to make the PCB compatible with you hard drive.
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Note: Send clear photos of your PCB (both sides) by attachments will make everything easier!