w124 steering self centering

[Amuso]

I've searched a bit here and found no real exact problem and possible solutions.

I had my W124 300TE in for inspection today to see if it is worth fixing it up and keeping it. One of the failures where that the steering will not (or is very slow) to return to center while driving.

What could cause this? I think I have learned that there is some sort of a steering damper. Maybe this could have such effect? Could it be the steering box that causes this?

Hopefully it is something that isn't too expensive.