what happened to your boot? im experiencing the same thing too. i followed it up myself, and everytime i wash my car, soap and water would leak into the boot via the left tail light, and itll stay inside one of the pockets.. :/ Turns out it was to do with water coming in via a hole where a rubber grommit should have been. The grommit looks like it was moved or just fell out, its the same grommit used by the reverse sensor cabling. But its plugged up and works a treat now. can you take a pic and show me? im going to look at my boot.