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Now we need to figure out who designed the tail light, Subaru or Toyota! 
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This part is likely neither Toyota's nor Subaru's. Small components are made my third party manufacturers. I had similar problem with Mazda. My tail lights were replaced twice. And when condensation developed third time, and car was already out of warranty, I bought a tube of transparent silicon sealant and fill up all space between two pieces that make the body of tail light. They are supposed to be glued, but apparently glue is not good enough. I never had this problem ever since. I would suspect that Subaru uses the same supplier as Mazda do, hence the same problem.