# Locating Component Serial Numbers

Before contacting Juniper Networks to request a Return Materials Authorization (RMA), you must find the serial number on the chassis or component. To list all the chassis modules and their serial numbers, enter the following command:

host1#show hardware

You can also find the serial numbers on the modules. ID stickers are usually applied near the ejector. See Figure 59.

Fan trays are not listed in the show hardware command output. ERX7xx model and ERX14xx model fan trays have stickers on the faceplate. For the ERX310 router, you must remove the fan tray to view the serial number ID sticker.

Figure 59: Representative Module Serial Number ID Label