Thanks for the update. You appear to have a hardware problem. This could be either the optic (DAC cable in your case) or the expansion module.
Try disconnecting the DAC if it is still inserted and running the port tests again. If the port shows up the cable is defective.
If this is still down, try removing the expansion module. Keep it out for 2 minutes and insert it again. Now look for the interface again before inserting the DAC cable.
If this is still missing then the module is defective.