2017 Malibu LT
I'm having the same issue with water in the trunk. I took everything out and put towels down to find the leak entry point. I have 2 leak points. One is straight down below the 3rd brake light, the other is on the left side panel behind the cover, but no water accumulating in the trough, just the panel cover damp but not super wet. Some have water leaking inside the car, but not me.