We have not been able to power up and control SAS library tape drives once removed from the library when on the technical bench for testing. What I have been told is that once a SAS LTO4 or 5 has been installed into a library tray it is no longer testable on the bench and out of the tray. Seems several of the LTO4s and 5s. The concept of the personality being installed at the factory does not always hold true for all newer type LTO tape drives.
Many of us in the repair field have the same issue and non of my associates in the business have been able to solve.