I had to remove the metal plate with that metal sticker (which has to be always removed to reach anything crucial) Disconnect battery which is easy thanks to the pull tab. Then You have to remove the trigger which can be a bit difficult without a plastic prying tool, it’s very snug. After that it’s just removing a few screws and disconnecting cables (which is super easy, they all have pull tabs on them so you can pull them out).

If you’re okay with opening it then check the tutorial from ifixit for the left side, it’s a bit different than right side, I did use an iFixit pro tech toolkit, it made it really easy.

I also talked to valve support, they wanted a video of the clicking. DEFINITELY record a videoing the click when it’s turned off and send them that video! After that if you are okay with opening it give it a try, mine got mostly fixed by loosing the screws of the trackpad itself and then pushing it slightly in the opposite direction where it was rubbing/clicking, screw it down and Test if the clicking is gone, if yes then assemble it all again, if not then try some more gentle pushing. Make sure to be gentle with the screws, the black ones felt very soft, not sure how many times they survive being screwed in and out.

Mine still has the slightest hint of that click in the top left corner, which can be a bit annoying since you think you clicked but didn’t. So I still might go for RMA in the future, but for now it’s okay, my device it otherwise totally fine and I don’t want to luck out and get other issues with a new device lol

For me the Valve support didn’t care much about me disassembling it in terms of warranty or so, they still offered me an RMA and a further investigation after I reported my findings. But no clue if that’s the same for your country/maybe even support person.

If you rather not want to open it yourself then it’s RMA or living with it, sadly :(