Detroit 60 series with a leakiing cam rear cap

My Detroit is leaking oil at the cam rear cap again. Is this job that I can tackle or should I take it to a shop? My main question is: do I need to loosen all the cam caps to remove the rear cap to repair the leak or can I remove only the rear cap to repair the leak. Also do I need the J-44706 tool remove the cap and torque it back down? Thanks

 

I commented shortly after Heavyd did. I don't know where it went. I cleaned the back of the head and ran the truck for about 15 min. I was hoping the valve cover would be the problem. NOT. The oil is coming out below that gasket and a little to the left of the cover with three bolts. I have a Detroit mechanic coming Wed. after supper to do the repair. Going by his information it is too much of a job for my skill level. Thanks Heavyd and GrapeApe.

 

I put a new injector/jake harness when I got the truck. The old one was leaking but this one is good. It is also completely dry around this one. I hear you on the left and right. I need to go back and double check myself.

 

It was the bearing cap not the 3 bolt cam cover or valve cover. I got it good and clean and ran the engine watching for oil. The o-ring between the cap and head appears to be bad.