You can receive hardware service through your IBM reseller or IBM Services.
To locate a reseller authorized by IBM to provide warranty service, go to the http://www.ibm.com/partnerworld/ and click Find Business Partners on the right side of the page. For IBM support telephone numbers, see the http://www.ibm.com/planetwide/. In the U.S. and Canada, call 1-800-IBM-SERV (1-800-426-7378).
In the U.S. and Canada, hardware service and support is available 24 hours a day, 7 days a week. In the U.K., these services are available Monday through Friday, from 9 a.m. to 6 p.m.
http://www-01.ibm.com/software/integration/datapower/library/documentation/v3.8.0/XI50.html
http://www-01.ibm.com/support/docview.wss?rs=2362&uid=swg24014405