In the last service on my 2010 Mercedes E-Class Cabriolet, the mechanic noted "offside link arm ball joint and nuts worn (Facing upward)".
I may replace it myself, but I'm not certain which arm they're referring to. I've annotated these images that I took with the names I know:
What is it that the mechanic is referring to? While under the car I was able to check that all of the ball joints appeared to move normally apart from the lower control arm, which I was unable to move after I raised the car from the axle stands. I assume, because of the mysterious "facing up" comment, that this is the one he's referring to?