Recently the front right suspension has been groaning on my '88 420sel. I can reproduce the sound by pushing down on the car from the left front, right front or the middle of the car. When driving, it makes noise when turning either left or right and when going over bumps. Because I can reproduce the sounds when the car is stopped, I don't think it's a problem with the sway bar link. Does anybody have any idea what it could be? I like doing the work myself, so can anybody give me instructions on how to fix it?