HP StorageWorks MSL Library Extender user guide (AQ746-96005, September 2009)

9. Secure the box with packaging tape.
Releasing the magazines manually
If you cannot remove the magazines via the OCP or RMI, do the following:
1. Power off both Libraries.
2. Unplug the power cord from the Library with the magazines to be removed.
Servicing the Library Extender64