This machine is a glorified TENS/feedback system run through what looks like a privately-programmed 486 PC.
Every item of technical medical equipment needs servicing. The piece of kit in question sounds a bit of a
lash-up to me, so I would be even more wary than usual!
We
all understand the issues, Clare, believe me. It's the vendor who has to make justifications, not you. They do
not have the right to force their equipment onto your hospital, or anyone else's.
See Rojo's response a couple of posts up! QED.

PS: I know what
I would do (but this is a public forum).