Diagnose this leak

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Situated on the right cam cover as you look into bay. This is pic from underneath the car looking up.



This is after doing 120 miles over 2 weeks since I last noticed it.



No drips on the floor, only noticed it when putting car on a ramp to change Lambda sensor.



engine has been put in this ZS 8-10 weeks ago, and when I took old one out, I swapped over the rocker covers and gaskets but I didnt torque or tighten the bolts to a particular torque setting.

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