I'm no Solaris expert but try
mt /f /dev/rmt/n status
to a loaded drive. Change the n to the drive number.
If you can take the Solaris system down to open boot OK prompt then do a
probe-scsi-all
That will send back scsi id's and firmware levels.
However, why not just get the customer to log into Streamline console? All the info you want is there in the GUI. You can also get it from the SL500 CLI. Ask the customer for his admin password and type, for example
<admin> drive 0,1,1,9 info
Regards,
STKman