Hi Oilfieldchild,
@ rdunnill: thank you for the inputs; appreciate it.
The LAN card is embedded on the motherboard so you won’t be able to replace it. As suggested by rdunnill you may use a 3rd party LAN card. For Owner’s Manual, please refer to the link: http://bit.ly/VkdC84.
Hope this helps. Please feel free to reply for any further assistance.