I've just had some work done on the same vehicle as yours
Its one press to super lock the vehicle, however if your internal latches are not fully flush once locked then there is a problem with the lo ...
It sounds like the knock you get from going over, say a pot hole or man hole cover, a dull thud from the suspension compressin the air or ball joints/bushes, its this sound but really fast. say 10 thu ...
Became a convert to the RRS fraternity a couple of months ago.
Not been the smoothest of transactions i might add.
Dealer was useless, for a car stated as excellent, required new brakes and discs fr ...