Have a 2018 Yukon Denali and recently had the rear washer go out. The wiper still works but not spraying any washer fluid. Checked the fuse and it was good. Tried it again, but nothing. Turned off truck and heard the sound of water dripping. Opened the back hatch the see my washer fluid coming out of the upper rear trim panel. I suspect that a line has been disconnected somehow but can't get the upper trim panel removed to inspect and fix. Any suggestions how that panel pops off? (You can still see the drip!)