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That's probably your problem right there.....
It's very common :
C300 2010 broken inner door handles - MBWorld.org Forums
The handles are available on eBay.
MB will replace the whole door card
FYI: The Complete M271 Engine thread. ( Revised and Updated )
It's hydraulic so there is no adjustment.
It could need bleeding.
Is there extra carpet under the pedal ?
The work must still be under warranty ??
Also fyi : Febi vs Mercedes tensioner for M271--R171 - Mercedes Benz SLK Forum
That's much too long. Mine was 2 seconds at the most.
Has the tensioner been replaced as part of the timing chain work ?
If this is an OM646 engine, then the earlier version had a breather assy that was a bolt-on to the cam cover with what looks like the same PCV...
Have a read. It might help :
2005 C180K MOT Emissions failure - advice sought - help!
I think you need a W5W which are blue. Then they match the H7s.
You buy a 12v extractor pump from the likes of Lidl and do it all from the top.
Have you checked the Sticky ?
what did your last slave die of ?
You have a failing sensor. Read the code from the parking cu to find out which.
Lots of hits on a forum search for P2279....
Check the front wheel bearing end-float.... ?
It it is an OM646 then the breather valve is on top of the cam cover.