Tail Light Switch Problems of Toyota Highlander

2015 Toyota Highlander limited--3 or 4 ounces of water has accumulated in both of my tail lights (that control brake lights and backup lights) that are located in the hatch of my tail gate. This causes a great deal of condensation to cloud rear brake and backup lights. When the tail gate is lifted the 3 or 4 ounces of water that has accumulated comes close to overflowing into tail light bulb areas which I am afraid will soon disable those lights and fail to warn others that the vehicle is braking or stopped which could lead to a vehicle crash. Vehicle has never been an accident that could cause the damage. Local Toyota dealership noticed condensation in right rear tail light on 22 March 2018 and recommended replacing tail light at a cost of $330. They did not notice a problem in right tail light. In the past two weeks I have noticed water accumulation and condensation in left tail light. First time I noticed the problem in left tail light, the right tail light was fine. After the next rainstorm 3 to 4 ounces of water has accumulated in both tail lights--the water and condensation still remain. I have attached the following photos; --condensation in both tail lights (pictures 8598 and 0928) --3 to 4 ounces of water accumulation inside both tail lights--pictures (2140 and 7546) show water in outer lower corners of tail lights when the lift gate is raised.

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Right rear brake light connection is bad. I have changed the bulbs and all other lights on that side work. The tail lights, hazards, reverse and turn signal lights all work. The only light that continues to not work is the brake light lighting up when the pedal is pushed down. Obviously, this is a safety hazard. This has been an ongoing issue for a year now and with online searches, I'm not the only one with the same problem.

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