[Silver Benz]

That's a help Martin...if you find the documentation I would like to see it also. I am chasing low output from my center vents as well.

OP - if I am not mistaken I think the reservoir is inside the passenger fender/liner. I am about to pull the fender off mine for replacement and I can get some pics in a few weeks should you not have this fixed already.

Seems to be a lot of center vent issues lately around here!