Vacuum leak????

[Dwg_23]

Hello all, inposted recently saying I had a splutter/ dead spot just before 2500 rpm no warning lights on.
I've also noticed the rear headrests don't go down and the headlight dipped beam adjust dosent work?
Are these related issues?
Ive heard there vacuum fed so couk be a leak? Where do I start looking??

Many thanks!!

 

[Dwg_23]

Probably handy to tell you it's a 2005 c220 cdi manual!

 

[Steve@Avantgarde]

Dont think so, the vacuum system on the headlights is supplied from the servo check the vacuum line on the back of the headlight make sure its secure.

The engine side of things are mostly electronic and as I posted before, you need a STAR test to move forward on this