Today I put the top down, driving down the street over a couple of bumps i heard a djing sound like having two spanners in the boot touching when going over the bump, sure the sound was nearside rear. On the way home put the top up and realised a noise is comming from the roof, sounds different now like a rod vibrating, loose at one end maybe, only when going over rough surface. Any ideas, a year ago the dealer changed the motor unit as roof not going up all has been good since and roof goes up and down smooth.