LB7 Leak from Valve cover at high pressure fuel line

[Samisunjp]

Looking for a little help to see what this leak is coming from. Looks to be coming from the rubber seals at the valve cover on the passenger side where the high pressure fuel lines enter. Looks to me like oil and not diesel. Is this the rubber seals in the valve cover leaking or something else?

 

[2004LB7]

Shouldn't be any oil in that area. Either diesel from the high pressure line or injector body or coolant from inside the head.

 

[PureHybrid]

You can replace those seals in the valve cover. Obviously it's been apart before, hard to tell if they half assed anything but I've seen those grommets weep before