Any here that have oppened up the wiper/combination/N10/2 relay for a Mercedes SL R129 class?

[MrShades]

I have some issues in the wiper, comination, N10/2 relay on my car.
The problems started some years ago but it was only the rear winndow defroster that did not work and some times the right side front park light would not turn on so this was not a problem.
But now when i park the car i hhave to take off the negative battery cable becuase the right side turn signal stays on even after i have stopped the and locked the car and that will drain the battery.

So i thought i should ask here if any here have taken the cover off of the wiper, comination, N10/2 relay and have some advice to give me before i start cutting it open.

Below is a picture of the wiper, comination, N10/2 relay, part number 129 820 10 26

 

[MrShades]

Forgot to say that i think the relay used on Mercedes E class W124 - C124 is identical i think..