Oil leak w212 - Throttle Body pip

Tele27

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W212
Hi All
Ive recently had a few issues with my w212 2013 car. There was a lot of hissing coming from the engine and loss of power. Turned out intercooler boost pipe had a split. I replaced it but since then car has been running fine but it gives really poor mpg.
I had a look under the car yesterday and saw a massive puddle of oil in trays so I cleaned it all so I can where oil was leaking from.
Today, I can see its leaking from the pipe which connect to throttle body...
Any one has any experience with this issue? Any guides or how can I get to it? Is it just the seal or do I have to replace the whole thing?

There is also a small return pipe which seems to be leaking oil out? Ive attached pictures of both

thanks
 

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