I have a Brother MFC-L2740DW and I need to replace the Network card

I have a Brother MFC-L2740DW and I need to replace the Network card

To replace the network interface card. I have done the reinstall of everything over and over and over. Luckily I have two of the same printers. So I got the other printer put it in place set the network card up and it worked. Network card needs to be replaced!! Help