IBM ThinkPad X20 Supplementary Manual page 52

Getting help and service
To determine whether your computer is eligible for International Warranty
Service and to view a list of the countries where service is available, go to
http://www.ibm.com/pc/support/, and click Warranty Lookup. Eligible IBM
computers are identified by their four-digit machine types. For more
information about International Warranty Service, see Service Announcement
601-034 at http://www.ibm.com/. Click Support & downloads, click
Announcement letters, and click Announcements search. In the Search by
letter number only field, type 601-034, and click Search.
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ThinkPad X Series Service and Troubleshooting Guide