Fixing a loose shutter button on a Supercolor 635

Lent someone my camera to take a picture of me and the shutter button is loose now. Still works but it presses with essentially no resistance and it seems like something I should nip in the bud before it gets worse? Anyone have any experience with this issue on the Supercolor or a similar camera? I suspect it’s a bearing issue but even if I’m right, I’m not sure how to fix that.