Change the transmission fluid in a 722.9 7G plus transmission (S550 4Matic - 2015)
1: The 2 rear bolts on gearbox oil pan (marked blue) are not accessible from under. Maybe they can be removed with a small wrench, but how to install them again and torque them to 4 nm + 180 degree?
2. To drain the oil in the torque converter i believe that the start/stop oil pump (marked red) need to be remove to access the converter drain plug.

I drilled two holes for the rear bolts so I could access them with a torque wrench. It was quite simple, the material was not particularly hard.
Just do it carefully so you don't damage the oil pan.


