Well in the early hours this morning I completely disassembled the 1710 (again). After testing with my fluke I found the traces that should connect the dual link connector to the PCI-E connector for the 7950 are cut. I was hoping that they were connected & it was a firmware issue that we might be able to hack, but that idea was quickly dashed by my findings.
I took some additional pics of the rear of the motherboard. You cannot see the trace pathways since it's a multi-layered PCB. I have detailed pics if anyone really wants them, but these pics should give you a general idea of what it looks like.