How to change Serial Number on IBM TS3100/TS3200 Tape Libraies. Use front panel to enable Telnet. Connect to the library IP-address using Putty (telnet). Type 'login' User Name: service Password: ser001 Using any of the following commands quotes " " MUST be entered. TS3100 Library: snum "L2U#######" TS3200 Library: snum "L4U#######" Replace ####### with the correct serial number. Do NOT include '-' Example: snum "L2U78AV237" Type 'help' to get a complete list of commands.