Geoff, Whilst looking at your list I did notice that the last update to the list was 2004, and that the list contained instruments and other stuff not related to BME. I have found a different list, does not say when it was last updated but does only contain medical equipment.

https://ohiocea.files.wordpress.com/2011/04/medical-equipment-life-expectancy-list.pdf

If you think hiring professionals is expensive, try hiring amateurs!