How to keep a machine running for thousands of years

How would I future-proof a complex machine or set of machines so that they will still be running 2000-3000 years from now? Is this possible with our current level of engineering and we just don't do it because it isn't practical/economical, or is this just straight up wishful thinking? What about a machine built two hundred years from now with all sorts of fancy future science?

Edit from comment below:I want to keep a cryo pod on an abandoned spaceship running for thousands of years a la Fry from Futurama. I suppose I could equip the ship with maintenance drones and 3d printers...

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How to keep a machine running for thousands of years

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