The oil for the ABC is delivered with 120 bar to the suspension.
Combined with natural decay of plastic it puts a lot stress on the pipes.
I had to change a pipe after eight years and it cost me 1.000 Eu, at Merc dealership.
There are 3-4 pipes like that.
The good news is: you can change each suspension seperately and not as a pair on a side, as ABC is communicating with each of the four suspension individually!!!
There you safe money again 😉