Similar issue here with T7810. Win7 x64 build task sequence went through to the end. Network driver detected and installed but IP address is 169.254.x.x. Network driver is "Intel(R) Ethernet Connection I217-LM" version 220.127.116.11
As the result of incorrect IP address the machine could not join to company domain and remain as a member of WORKGROUP. When Win7 OS is fully loaded, I can login with local account, the IP address is fine and can manually join domain with no problem.
I also suspect that the driver is wrong as well. Please share if you have solution.