If those stern eyes are reasonably new they are probably ok. If they are original - replace them. Where the eyes go through the transom there isn't any way for air to get in there and even though they are stainless, they are subject to corrosion cracking over time (years). Unless they are really bad, it is very difficult to tell by just looking at them until they fail. Both of mine were cracked and one was broken when I pulled them out; it took a magnifying glass to see some of the cracks on the 'less bad' one. They are relatively cheap and easy to replace.
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