I have a Yaris Cross 2021 model which has a leak in the tailgate door. After heavy rain, as the door is opened water floods out from the area behind the offside rear plastic bit that allows the bulbs to be changed. There is no leak when it is dry or when the rear washer is used. So water is entering the sealed door somewhere. I have checked all the rubber seals and they appear to be intact. It is looking like there must be a fault in one of the seals for water to collect inside the door? My next