Ducati MULTISTRADA 1200S ABS 2015 Workshop Manual page 684

Removing the rear shock absorber
Remove the seat (Removing the seat).
Remove the rear LH side body panel (Removing the side body panels and the tail guard).
Remove the exhaust silencer (Removing the silencer).
Remove the rear wheel (Removing the rear
wheel).
Remove the rear mudguard (Removing the rear mudguard).
Remove the retaining bracket (1) of the preload control (2).
Disconnect the connectors (3) and (4).