Guys, I'd like to share my experience removing the wiper assembly, hope it helps someone someday.
First of all put the wipers in service position through the MMI car menu, it helps to remove them from the pivots.
Pop the wiper arms cap and remove the 16mm bolts.
The driver side may need some force a little bit of wiggling since the pivot is metal and the arm aluminum (galvanic corrosion). Remove the cowl cover, its only snapped in a railing at the bottom of the windshield and the weatherstripping in front.
This is what you'll see, there are (6) 30 torx bolts to remove. 4 on top and 2 near the back of the engine (the flash got them pretty good in the second picture). Whatever you do, do not remove the (4) 9mm bolts at this point, they hold the motor.
The assembly comes almost straight out, don't forget to undo the electrical connector at the back of the motor.
It's a good idea to clean/lube the pivots (that was the cause of my failure) to do so, just remove the circlip at all 3 arm pivot, clean and remove the rust, reinstall. At the same time I did the rest of the mechanism and the motor with white grease.