Xbox Elite Series 2 Controller Replacement Under Warranty Also Faulty

Warranties cover a like for like replacement if required under that warranty so as far as I know, yes, if you send an Elite series 2 in for replacement you will receive an Elite series 2 back.

There have been many issues with the Original Xbox Elite Controller Series 2. Peeling grips, sticky "A" button, and faulty bumper buttons were among the common issues at launch. Microsoft appears to have fixed the issues with the Series 2.

If your controller is under warranty, then repairs are free. If your controller is out of warranty, then you'll be charged a repair fee.

Check your warranty status here: https://account.microsoft.com/devices/select-device-for-repair

The Elite Series 2 controller has a 1 year warranty.

If your controller isn’t working and needs replacing, go to https://beta.support.xbox.com/help/hardware-network/controller/controller-warranty and
enter the controller’s serial number at the bottom of that page. For the Xbox Elite Wireless Controller Series 2, the 14-character serial number is in the lower centre on the back of the controller.

Unfortunately, your warranty period expired in February. For Elite Controllers, it's 12 months in the UK and 90 days in the US (unless purchased in an Elite bundle, which is 12 months). If you attempted the RMA process prior to the warranty expiring, customer
support might make an exception.

Personally, I would keep contacting support regardless of the warranty period expiring, as Microsoft knows these controllers are defective. In the US, there was an unofficial program offering a one-time free replacement to Series 1 owners.

For anyone else reading this response in the future:

Never buy Xbox Elite Controllers, including Series 2. They are overpriced and faulty.

If your controller is faulty it and it's still under warranty you should be able to replace it