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I'm pretty sure the OFH is the source. There is oil in the tell-tell spot.
If there is oil on the waffle iron then you are correct its too high to be the oil pan gasket.

From my time on the forums I have heard that some poeple have to replace the housing itself to finally rectify thier OFHG leak. Seems the housing itself can warp/become damaged in such a way to require replacement.
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