Dear all I have a 99 CLK convertible. The roof has suddenly stopped working. What is the best way to diagnose what is wrong? When it stopped working it was in the open position and would not release the flap to allow the roof to close so was luckily "locked" in the open position. Also the rear headrests stopped working at the same time (prob linked to this) as they used to sit at the bottom but now click slowly upwards until fully at the top. When I press the switch they do not come down unless I lean on them, then they click and come back to the top. Any help is fully appreciated as it cost me £500 just to get the mechanic to get the roof back up.