Assuming that you used a RAID-5, I don't think it will be helpful
to connect one drive to a PC. You will need to connect ALL drives
at the same time to recover anything.
So there is really no point in trying to figure out which drive is bad and replacing? I do remember when I set it up (like 5+ years ago) that it was set up to where if one drive failed all I had to do was swap it out for a new one, thus I was not able to use the full TB of space. Not sure if that helps any.
A TS in EM mode is not a good sign.
Are you trying to use the updater with the EXACT SAME firmware
version already running on the box? If not, try this first.
Well the latest firmware for this device was from 2007 and I am pretty sure I have updated it since then, so I am assuming it is the same firmware.
Your suggestion at this point is to connect all drives and use the UFS Explorer to attempt to recover any data?