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I get quite a few pre-lci F10's through the shop with water damaged headlights and all the faults that go along with it.
From what I've seen its usually the seal between the lense and the housing that allows the water into the headlight. The module that eats white death is usually the control module that looks like an old Nintendo cartridge in the bottom of the lamp.
I've smoke tested a few watery headlamps and they all leak from the main housing. Clients balk about the cost to replace along with the module(s) and I don't know what happens from there because I haven't seen one buy the correct repair yet!
My recommendation is to pressurize the headlamp assembly with smoke in the same manner you would smoke test an engines intake tract looking for vacuum/boost leaks and then you will have your answer instead of throwing parts at it hoping to get lucky.
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