Replacement Hitachi PCB OA56992 is available on HDDZone.com. To swap Hitachi PCB with Main Controller IC Number OA56992, your should make sure the Main Controller IC Number on your original pcb is OA56992 too.
Hitachi PCB OA56992 Image:
Hitachi PCB OA56992
Hitachi PCB OA56992 Additional Images:
Hitachi PCB OA56992 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!