2022 Rear Light Moisture

[DrElectron]

I noticed today that one of my rear lights (left side indicator and reverse) had condensation inside the lens.
Took both bulbs out and was greeted with a gentle splash on the face of water.
Of course, the bulb holders are at the bottom to make replacing the bulbs easier, but then they fill with water.
The bulbs and holder contacts are corroded.
Looking at the enclosure there's no sign of any breakage so I have no idea how water has been getting in there. RHS completely clear.

Here to advise others to check theirs.