Seagate 100535704 Barracuda 7200.12 PCB Circuit Board

Q1:  Hi, i´m looking for a PCB with these hard drive details:
Barracuda LP 500 GB
Serial Number: 6W15HJH
Model: ST3500412AS
p/N: 9TN142-301
Firmware: CC32
Date Code: 10372
Site Code: SU
Board Number: 100535704 REV B

Q2:  Not sure if you could help me with this but I had a friend buy the Seagate 100535704 Barracuda 7200.12 PCB Circuit Board
Board Number: 100535704
Main Controller IC: B5502C30
HDD Motor Combo IC: SH6964BD
Because his hard drive which is a Seagate Barracuda 7200.12 Model # ST3500418AS would not power up. The board that I got is powering up the drive but it is saying that the model # is ST3_INVALID_PFM. I tried to update the HD firmware but it won’t. due to it giving the wrong model #.  I was wondering if you could help in this situation?

This Seagate 100535704 Barracuda 7200.12 PCB Circuit Board is listed in Seagate Barracuda 7200.12 PCB on HDDZone.com