Hi I'm having a problem with my 2010 E class cabrio. The steering makes a clunk when turned to the left. The noise is only there when the engine is first turned on after a couple of min of running it stops doing it. The clunk occurs when the wheel has stopped turning ie if you turn quarter of a turn the steering clunks the moment you stop turning the wheel. It occurs at stationery not when moving. Going to my local Indie soon but already expect a 2kish bill as I'm not hopfu. Is there anyone else had a similar thing? Are steering racks common to go bad? I did previously have a strut bearing that needed attention before but this probably is the rack.