RealSense cameras cannot be sent for repair. You can file a claim with Intel for a replacement camera if you purchased it from Intel's online Click store. Details of filing a returns claim can be found in the link below.
It may not be necessary though, as the camera is likely fixable. Here are some initial actions to try:
-. Is the camera detected in the Device Manager if you plug it into a different USB 3 port (if you have more than one).
- Have you tried inserting the camera into the USB port quickly and firmly instead of inserting slowly?
- When you have hardware that is having problems, Windows' built-in trouble-shooter tool may be able to help.