yeah, review that other thread and we can work it over there. But we might need a ticket ultimately.
BTW, ML6000 tape devices don't display service tag. I don't think the SNMP agent supports that field.
On your R720, please run the Dell Troubleshooting tool against the server. If it is SNMP + OMSA, run the SNMP test and let me know if the result set displays the "Server Administrator" version in the result table.
Rob