Hi I've got a 2019 C lass W204 and I can't get the rear passenger door open from the inside or outside. I've got the rear seats out of the way but I don't think that's going to get me access to the lock. I'm trying to replace the actuator which I know is gone. Having spent a fortune on the suspension I'm loathe to take it into the workshop as I'm told "there will be damage". Any ideas?