Can you help identify this part

[macca82]

Hi I have a 2011 caddi maxi 1.6 tdi and have some oil buidlup on a part on top of the engine (see image below its the item in the yellow box with the pipe running off towards the firewall.

Thanks in Advance

Glenn

[Umai Naa!!]

PCV chamber.

[macca82]

Im guessing if it has oil on its leaking and should be replaced?