well, after a long battle, the issue has been found. To those who said a blockage in the galley, you were right! No idea what it is, or where it came from, but this was found in the main oil galley pretty much right where it intersects with the feed for the tappet galley. Took some persuasion to get it out. It is hard plastic, about 1.5 inches long. I can unfold it and fount it to be cylindrical in shape.
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