407 rattles

There is no problem in my 407 when driving on a straight road, but when I enter the slightly bumpy road, there is a loud sound from the rear, the rear undercarriage has been fully looked at. I went to 3 masters, 3 of them say there is no problem in the lower team, they say like a stone, I cannot solve the problem. The feature sounds more from the right rear, this rattling sound. It sounds too much when passing through a slight hole or something

I have that same problem. I couldn't cut it, let the weather get warm, I'll try to remove the seats and the door trim. I'll also remove the rear spare wheel. It will be a bit of a challenge, but it will be a bit difficult, but it will be broken or loose as if there is something in the right rear door ....

may be engine and transmission paddles. Maybe there may be a problem with the rear suspension. I also heard a sound from the front. the auricles and the bellows of the suspension blew up. the master had said it from him.