My 98 land cruiser has started leaking a sticky/oily substance from the panel armrests on both the driver and passenger rear doors. It seems somewhat corrosive because I has stripped some paint where the door weather seal contacts the car on the bottom. I have taken the door panel off and there is nothing going on inside the door or on the backside of the trim panel. It is almost like the darker trim is melting? Any thoughts on what is going on?