And they get replaced. Every inch of steam plant piping has been replaced more than once, every pump, valve, turbine, cooler etc. has been rebuilt, replaced overhauled UMPTEEN times.
Yes, she has a long proud history, but she also carries the name of ANOTHER ship that was decomissioned and scrapped.
Truthfully, she is nearing the end of her economical and useful life. I say retire her and make her a floating museum as soon as we have a replacement. (And we cn blame clontoon for NOT having a replacement.)