The part number for the USRM doesn’t depend on the underlying hardware, but what the software is licensed for. So it doesn’t seem to matter if it’s a Dell PowerEdge 850 or a PowerEdge R210. If you “cat” the “license.conf” file on the USRM, you’ll get something like this:
# cat /opt/usrm/ConfigFiles/license.conf
The part number appears as:
…but should be reformatted as follows for the RMA:
In many cases, the USRM will be dead, and you won’t be able to look at the license file. But all your USRMs are probably licensed the same, so just get the part number off one of your working USRMs and then reformat it with the dots and the “.AA” at the end.