Avant upper tailgate light

I haven't attempted this yet (and I don't think it will be a major job given how much i've modded this car) but before I start... Does anyone know how to access the top light on the outside of an avant tailgate? And what bulbs are inside?
Mine seems to be a bit dead on one side. I always thought it was an LED strip but apparently not. My MOT/Katsastus guy told me last year it needs to be fixed. So I've now remembered 11 months later to fix it. Could be worse. Could've been 12 months

I've searched the forum but haven't found anything. If nobody knows about this I'll work it out and post my findings here.
cheers

excellent. thanks. I hadn't even noticed those little end caps. I need to take a close look tonight when I get home. Maybe I need to replace the whole ****** unit rather than bulbs? bugg3r.