D4 annoying squeak from rear o/s

Hello

I have an annoying squeak from the rear drivers side wheel. When moving slowly and braking to a halt, it squeaks. When I stand on the wheel and rock the car side to side is squeaks really loudly.
Sounds as if it’s coming from the air suspension unit or in that area. I have sprayed all the bushes with wd40 to see if the squeak goes but still the same. I have lived the top hub bush inside by injecting it. I just can’t pin point where the squeak is coming from.

Any idea or a common squeak or way to narrow it down to which one is causing the squeak?

thanks