I would guess that these things need a lot of specialized, complex maintenance to remain functional. But who knows?
Used to have steady customer at the shop who claimed to have been a tech for these decades ago.
No way to know if true or not but the part of his story that made me go WTH was his claim that his location at the time was Panama.
Why would we have such in Panama?
He never got specific but did seem to have pretty plausible general knowledge about the subject.
Only reason I could ever come up with for Panama would be an emergency shut-down of the canal?