Flickering estate/combi/wagon cargo area light

Ever since I got my new Octavia combi/estate "Scout" in September 2020 (last of the MkIII Facelift, manufactured April 2020, 2.0DSG-7 automatic Diesel, full LED headlights package, but standard 2013-era bulbs in the interior), one of the two cargo area lights has flickered.

By "flicker" I mean, I open the cargo area rear hatch, and the right side light comes on and stays on solid, and the left side light tends to not come on, or to come on and off intermittently if I tap it or bump that side panel as I'm loading/unloading.

If I tap the lens of the left-side light a couple of times until it turns on, it will stay on unless/until I happen to bump into it/ the left side panel again.

The cause is pretty clearly a loose wire/connection behind the side panel, because I recently changed out the bulb from the factory original 5W halogen to a much brighter LED bulb, and it still does exactly the same thing.

Since it doesn't seem to be the blocky connector of the lens-and-bulb assembly that snaps into a ~2cm wide x 6cm long rectangular cutout in the cargo area interior side panel, as I removed that and reconnected it as part of replacing the halogen lightbulb within the lens unit with the LED bulb, I assume it's the flimsy two-wire connector which provides the blocky connector to the lens, and then disappears behind the panel to somewhere I can't see.

Any guidance on how to get at the other end of that flimsy 2-wire connector, to see what might be loose, and try to tighten or otherwise repair it?

(I fear that I'll have to remove the interior left-side panel, and of course I don't want to break anything...)

thanks,

-Jay