Here's how to remove the rear bumper cover.
Remove the expanding rivets (1) and press the wheel arch trim (2) to one side.
▶ Removing trim for water channel
Detach rotary clip (1).
Feed out and remove trim for water channel (2) from guides (3).
▶ Remove the rear light on the side panel
Detach cable from guide (1).
Unlock and disconnect the plug connection (2) and remove the rear light .
Carefully detach side latch mechanisms(2) in direction of arrow.
Carefully detach latch mechanisms in area (3) to the rear.
Pull the bumper panel (1) straight toward the rear in direction of arrow with an auxiliary person.
Unlock all plug connections and disconnect.
Remove the bumper panel (1).