Preliminary Work

Removing rear wall trim panel → WM 703119 REMOVING AND INSTALLING REAR WALL TRIM PANEL - chapter on "Removing"
Open hydraulic valve of the hydraulic pump. → 618419 REMOVING AND INSTALLING HYDRAULIC PUMP - chapter on "Information"
Remove cover.
1. 3.1. Pull off cover from convertible top lock.
  
  Fig 1: Removing Convertible Top Cover
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Move locking hook to end position.
1. 4.1. Insert the Allen key -1- into the convertible top lock -A- and move in the direction of the arrow "Open" (inscription on convertible-top lock) until the locking hook is in the extended end position (perceptible stop).
  
  Fig 2: Locking Hook To Extended End Position
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.