Kerimac

My husband and I are the proud owners of a 2004 SL55. Everything is great on the car, but we have one issue. Seems the distronic goes off at random times. We can't locate the sensors (they are not the circle sensors you can see). I have combed the Internet, so I figured this forum could give us some answers! The owners manual says they need to be cleaned, but I can't do it unless I know where they are - yes, Captain Obvious! Can anyone help?
I am also assuming the distronic is the blue lights on the dash with the buzz sound.

Thanks!