I replaced the ballast and adaptive headlight module with aftermarket pieces from Amazon (China) after running a hair dryer into the headlight for a few hours to dry everything out. Ran a bead of silicone around the entire lens/housing interface because I really don't know exactly where the water was entering. The rear cover could have been loose, but I never removed it since purchase of the car. I can see how people don't get the cover tightly placed on the back of the light though. If you don't get the tabs into those 2 indents, it's possible to leave a gap right there at the bottom/rear of the light housing - right where the ballast sits.
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