Hello and welcome to just answer. Let me see if I can help you with this. Whenever we see this, it is almost always a plugged sunroof drain, or some other leak at the sunroof. If you open the sunroof, and look at each of the 4 corners, you will see a small drain hose. the front drains go down the front a pillar near the windshield, and the rear drains go behind the cab just in front of the bed. Get a container of water and pour it down into each drain hole. You should see the water come out of the drain tubes just behind the front wheels and behind the cab. If you do not, then get some compressed air and try to clear out the drain. The other leak spot we see is at the 3rd brake light.
Here is the info on pulling down the DVD player, and I hope this helps.
1. Disconnect and isolate the battery negative cable. 2. Remove the four mounting fasteners (1). 3. Disconnect electrical harness connector and remove monitor/player.
Does your DVD player look like the one in the picture?
Then there should be 4 screws. 2 under the remote, and to more towards the front of the unit. If I had a truck here with the DVD player, then I would go look at it but I don't at the moment.
Hey thanks for the picture! That front clip/bracket just pulls down off of the bracket. It is sometimes difficult, and using a screw driver to bend /squeeze the clip will aid in releasing it. I have had problems getting these to come loose. Let me know if you can get it to release.