Solution
Please refer to the link and follow activation Warranty Extension step.
http://member.asus.com/faq/member_faq_us.htm#extend
We could help customer to register WEP (warranty extension packages), but need some information:
Product purchase date: please also provide soft copy of invoice
Customer email: we will register product & activate warranty extension under this email account.
WEP must be purchased within 180 days of NB purchase date.