They just pull down (springs hold the pucks up - watch out for the springs snapping back and hitting your fingers when you take them down). I would expect in a 2022 the lights are all sealed LEDs. You can not open them. You would replace the whole unit. Only a couple of different sizes and available at many places.
Also, check the wiring. If the light does not work, it maybe a bad connection. I have seen a lot of bad crimps in the trailer.