There is water leaking into the rear interior at the top of the lift gate. It's a slow and steady leak and the floor mats in trunk area are damp after rains. There are also water stains on the inside rear roof. I stared at those stains for over a year and wondered whey might have come from (I bought the car used), but this morning I noticed water droplets on the rear seats. I'd be grateful to any insight the community might have. Thanks.