Number 4 main bearing cap and journal. Almost new. No wear or any marks - can still see factory machining on the bearing metal.
Number 2 isn’t much different. A couple of lines so fine you can’t feel them with a fingernail (and as some here may observe, I have a decent supply of fingernail today).
Looking at the location of the oil filter/cooler setup, I believe it feeds the rearmost bearings first. Obviously I won’t disturb 5, as that would impact the rear main seal.