They told us that those chains can look great, but have microscopic corrosion and should be replaced every 8-10 years. Great. So we ordered that new part. It should be here next week.
We also discovered that the plastic drain fitting in the propane locker was broken and would have allowed gas to drain into the bilge if there had been a leak. Great. So we replaced that too.
We did check one little item off the list though.