MB leaking headlight

[NZ XR6]

With the cooler weather I've noticed some condensation inside the RH headlight lens. I removed the headlight assembly this morning and found a broken latch on the plug, no doubt from a recent visit to the panelbeater for repairs, and about 10 ml of water inside the headlight. The panel damage to the car was on the LH front, so the headlight should not have been affected.

I have drained the water and left it in the sun to dry, but cannot see any damage that would have let that amount of water in.

Anyone else had this problem?