Aye, those medical units really were designed to be overhauled every two years and replacing the tubing would have been as routine as replacing the filter.
Because the medical units were supposed to run 24/7/365 the overhaul thing never allowed the hoses to get old enough to become a problem until us hobbyists started using them 40 hours a week for 8 to 12 years.
Once one hose starts to show that kind of age it is probably best to just replace all the internal hosing you can get at.
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