Lenovo ThinkPad SL300 2738 Hardware Maintenance Manual page 68

The algorithm that generates the number is designed to provide unique IDs until
the year A.D. 3400. No two computers in the world have the same number.
When you replace the system board, you must set the UUID on the new system
board as follows:
1. Install the LENOVO ThinkPad SL Series Maintenance Diskette Version 1.01 or
2. From the main menu, select 2. Assign UUID.
60
ThinkPad SL300 Hardware Maintenance Manual
later, and restart the computer.
A new UUID is created and written. If a valid UUID already exists, it is not
overwritten.