The Carrier Grade line was sold off to some other company, so the TIGPR2U and other carrier-grade don't even show up under Discontinued Products anymore.
I have the old Quick Start Guide, but that doesn't have a parts list. Is there anything in particular you're looking for?
I'm looking for the part number of the board where the scsi cables and the fan power are connected. The server is crashing randomly and I believe this board is the problem so I need the part number in order to get search for a replacement. I didn't find a clear part number on the board itself.