^^ with the OFHG - if you're above 110k miles or so its probably absolutely the culprit - to know for sure you'd have to take off everything up to the throttle body and move the electrical box out of the way to see it, but if its a "mystery leak" and not the VCG (which is easy to feel for and see) - its 99.9% the OFHG - the CCV doesn't leak but if you are doing the OFHG you should do the CCV

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards