I know this sounds lame since it was just sent back from repair or what ever, but I have had it happen that a "new" board is replaced and it has an anchent bios on it. I would at least check the version of this machines bios compared to the other E6410.
Depending on if you are using dos and the univeral packet driver a10 bios update has items specificly for the pxe option rom and that is what the universal packet driver runs off of so it would be a good idea to look at.
I am not 100% sure this is the link you need but look into it further would be my suggestion.
1. Added support of Signed Firmware BIOS. 2. Fixed fail to create or change Hard Drive password from DDPA 2.0. 3. Addressed FDE hard drive detection issue. 4. Fixed USB data transfer issue lockup with iTunes application. 5. Updated the PXE option ROM to version 1.3.76