NewEgg will only let you RMA the product to them for the 1st 30 days, after that point you have to contact the manufacturer directly and place am RMA request with them
Actually, they will let you RMA a motherboard to them up to one year from date of purchase ( I've done this a few times). Just go online, go to "Online RMA Request" and log in using your e-mail address and password. It will then come up with a list of items that you can RMA back to them. Check the one that you need to RMA and type in a reason. Your RMA number should be e-mailed to you within two days.
Also, newer Asus boards have three-year warranties.