Re: Chronic fog / condensation in rear tail light (driver side)
If there's moisture inside, that presumably means the housing has a crack somewhere. If you leave it as is, you'll get corrosion in the circuitry. Can you remove the bulbs from the housing to let it dry out, then inspect for the crack and seal it? You might have to pull the housing from the car to find the crack.
2010 MS3 Sport Black Mica w/ CS SRI and TIP, ClearMask Aerogard, SGII, 40% tint, silver dash trim (Winter: 17" Borbet LV5 and ContiExtremeWinterContact)
2011 Subaru Outback 2.5i Premium