C13 oil leak

Trying to track an oil leak on the back of the head. Valve and rocker box gaskets changed about 14k miles ago but didn't help. Has a fairly steady stream running down passenger side rear of block. Losing 1/2 - 1 gallon a week mostly from this leak.

2004 c13 kcb in a freightliner columbia

 

Dealer changed valve and rocker box gaskets for me because of the leak. Paperwork claims it was the rocker box originally leaking but doesn't appear to have changed since it was done. Doesn't appear to be from the valve cover. All the oil seems to be below it but can't pinpoint the exact spot since it's hard to see back there. Will try to get a picture later

 

I don't believe so but maybe. The block Is fairly dry till you get to back corner of the valve,rocker box, head. I can see ithe drip from the back corner but can't tell where from yet

 

I think they replaced the harness but not sure. I'll have to pull the paperwork out and see