
The oil seems to be coming from behind this part.

What is it? I might be able to tighten the bolts but I suspect it will need a new gasket. Is that going to be a difficult job?
The diesel leak, seems to be coming from this part. <photo taken from under engine>which sits just behind the left front wheel strut.

It looks like there is an oring seal (arrowed). It could be just that seal.
What is this part, and if I undo the bottom to replace the seal, will I get a tank full of diesel over me? Will I need to re-bleed the system?
An lastly, I heard of something called a TIS? is this a Transit specific manual on CD or a parts list or something else.
I need a manual, and if this is one, where do I get it from?