Update:
Removed headliner. Pretty easy, just an hour or so of careful disassembly. I was pleased by how clean things were underneath headliner. My passenger side rear drain was clean but partially kinked. My driver side rear (which was where the problem was originating) was partially clogged...
Update:
I'm going to remove the headliner and inspect for kinked/cracked hoses and do another round of cleaning out the rear lines really well. My first pass at cleaning the rear lines involved light gauge wire which I pushed as far as I could and got water to flow through the line, but...
JohnVee, from my video have you identified that mine are broken or are you recommending it as a possibility? I'll look at them later today.
stu8319, I have cleaned all four lines, two in the front and two in the rear of the sunroof. Thank you for your input though.
My sunroof has been leaking and when I move the sun roof reveal back and forth, it sloshes water somewhere above the headliner and drags the water out with it, as seen in the attached video. I've cleaned the all four of the drain lines and all the slits under the truck. This wasn't a problem...
SOLD
1996 LX450 second row speaker grills oak color. One grill has one of the three speaker basket clips broken but grill still clips on and works. The broken clip comes with the grill, but I didn't use it.
SOLD $25 + shipping