A technician has removed all the tapes from a tape library to work on the...

According to IBM Spectrum Protect documentation1, a command that should be done on the IBM Spectrum Protect server to ensure the library inventory is correct is AUDIT LIBRARY2. AUDIT LIBRARY is a command that synchronizes the server inventory with the inventory of the library device. It can detect and resolve inconsistencies between the two inventories, such as missing or relocated volumes.

https://www.ibm.com/docs/en/spectrum-protect/8.1.9?topic=utilities-administrative-commands

https://www.ibm.com/docs/en/spectrum-protect/8.1.9?topic=ac-audit-library-audit-volume-inventories-in-automated-library