The Chromebook model and serial number can be found on the manufacturer sticker located on the back of the device. Alternately, If the sticker is missing, you can hold down (alt + v) on the login screen while the device is powered on to display the serial number and the model name. These numbers will be displayed on the bottom right corner of the screen.
If the device is not currently under it's original warranty, DHE cannot provide extended warranty coverage. Please follow the link below to check warranty status before placing an order.