WARNING: This page is about a different car, the 2016 Porsche Macan and 2015 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
Pull rear lid seal -1-
off the sheetmetal flange.
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Remove all the old sealant from the sheetmetal flange.