Seagate ST3750840AS SATA 3.5 PCB — Part 9BJ138-277, Firmware 3.CQD, Sticker 100406528 D

Replacement PCB for Seagate 3.5" SATA hard drive model ST3750840AS. PCB part number: 9BJ138-277. Firmware installed on the board: 3.CQD. PCB sticker reference: 100406528 D. Board identification: 100406533 REV A. Confirm matching part and firmware numbers before fitting to ensure compatibility.