I had a leak on my 2020 1500 Laramie.
I thought it was the brake light, because my 2013 leaked, and I was able to seal it myself. Not the case on my 2020. After seeing pictures on here of the rear window surrond cracks, mine looked the same as the pictures.
Unfortumatly for me, I just put a cap on the truck. So I removed the cap, dealer tested and duplicated the leak. Ordered a new rear window. And scheduled their local glass guy to replace it, which was only two days later. The dealers technicians removed the rear seat and headliner trim, had the glass guy swap the rear window, and the technician buttoned it back up.
I checked thoroughly for any damage, and thankfully found none. Besides them not vacuuming their mess, and wiping down their fingerprints, including the glass. I was satisfied.
I did notice that the glass guy placed a large bead of Ultra Black silicone along the outside window frame, that is primarily covered with the trim surrond.
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