Replacement Hitachi PCB OA71256 is available on HDDZone.com. To swap Hitachi PCB with Main Controller IC Number OA71256, your should make sure the Main Controller IC Number on your original pcb is OA71256 too.
Hitachi PCB OA71256 Image:
Hitachi PCB OA71256
Hitachi PCB OA71256 Additional Images:
Hitachi PCB OA71256 Main Controller IC 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!