It's your call whether to replace them or not. As I said, I'm not sure just how much if any of them might be normally visible.
If you do replace them, be sure to get all of the old ones and anything else cleaned out of the groove where they rest. The inside of that groove is rough (rougher than you would think for something they put so much emphasis on having clean) but it sounds like you're doing a through job of cleaning out the motor. A pick, a strong light and a mirror to slip into the hole to chekck things out would be in order.
Arguing against changing them out are a) the assumption that they are not leaking, b) it may be they look completely normal, and c) if the bores of the sleeves are out of round any, you might have more problems if you put the sleeves back with the egg oriented differently. If you want to replace them anyway while you are in there (not a bad idea), C can be overcome by scoring a light index mark for each sleeve in the top edge of the sleeve and onto the top of the block so that they are lined up as they were if you reuse them.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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