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It's basically, take everything off the side, starting at either the hatch or the passenger door. C-pillar and D-pillar have to come out, rear latch cover. Lots of clips behind a lot of panels, all of which have to be handled carefully or you'll break them.
There's not just one set of instructions, it's multiple components, many of which dependent on something else coming out first.
WM 700319 REMOVING AND INSTALLING SIDE TRIM PANEL FOR REAR LUGGAGE COMPARTMENT (EXCEPT CAYENNE, CAYENNE GTS, CAYENNE TURBO S, CAYENNE S, CAYENNE S E-HYBRID, CAYENNE TURBO, CAYENNE S DIESEL, CAYENNE (3.0)) > PRELIMINARY WORK
Remove C-pillar trim. → 706819 REMOVING AND INSTALLING C-PILLAR TRIM
Remove the rear side trim panel. → 707519 REMOVING AND INSTALLING REAR SIDE TRIM PANEL
Remove D-pillar trim. → 706919 REMOVING AND INSTALLING D-PILLAR TRIM.
Remove cover for rear lock support. → 703919 REMOVING AND INSTALLING COVER FOR REAR LOCK SUPPORT
Anyone try doing this? I couldn't figure out the rivets in the last step. They look almost like they have torx in the middle, but that didn't work, and then I tried pushing in the center in case they were pop rivets.
Most of those have a flush center piece that has to be pulled outward while keeping pressure on the outer collar. That allows the spread tabs behind the panel to collapse and allows pulling the whole thing out.
The lesson here is look up the area in question using one of the dealer online databases. That'll generally give you a list of what parts are used in the area. Then search for pictures of the part online.
There are an assortment of plastic body panel removal tools, often sold in kits. Some have finer edges that may allow removing the rivets without marring them (much). Though I'd imagine the dealer would remove/replace them with new.