Those bulbs aren't replaceable. The whole unit will need to be swapped.
I have a feeling they're not replaceable too. A friend just had some installed that are similar and was told that the bulbs aren't replaceable in them. I found it very bizarre, seems quite wasteful for when they eventually blow, although of course because they're LED we're told at the point of install they should last for way longer than normal bulbs.
I had some when we had the bathroom refitted, eventually all but 1 blew so I replaced them with ones where you could change the LED bulbs, it's something to do with the IP rating and they are fireproof or something of the sort.