Rear bumper removal

Hi,
Making another post and hoping I might get some replies (2 other posts failed to get any response!).
Just finished removing the rear grill and complete rear bumper as I plan to install another exhaust system. Also removed the inner wheel liner/protectors to clean and gain access to the engine bay.
The left hand side was fine just a tad muddy so just cleaned the liners with soap and water and coated with back to black.
However the right hand liners had quite a lot of oil residue on the top side and further investigation revealed some further oil residue on the chassis and area surrounding what I assume is the F1 gearchange module (?) - I’m guessing this is what it is as there is an oil filler as part of the assembly.
Does anyone know if this is normal or something I should be worried about?
Any help would be gratefully received.

 

Thanks for a great response.
I’ve also put it in 360/430 as I assumed it had posted there but the site seems to jump around.