So I have recently purchased a 2004 L322 TD6 and am working my way through some niggles. I have a very bad vibration / noise which I have narrowed down to the drivers side wiper arm. (If I touch it the vibration stops as it does if I engage the wipers) Only happens (or I can only tell / hear) when car is stationery but with drive engaged. Has anyone come across this before as I can’t see any reason the wiper would do this. TY in advance