Do machines reduce labor... or so they redistribute, alter, and globally increase labor?
The only "perpetual motion machine" is life itself.


No it is not. We also convert energy to heat as we go through life. We are certainly not immune to the second law of thermodynamics, we increase entropy all the time. 


  Machines cannot run or reproduce themselves.


Why not? There is already factory robots making other robots. But of course, they run on fuel. But again, humans also run on fuel, we just call it food. 


  [...] someone must obviously make, fuel, and maintain the machines. Someone else must [...] mine the additional metals, feed the miners who mine the metals, [...]


Yes, there is a kind of dependency graph, and for now there are many spots for humans, there are many things the machines just cant do. But there are no fundamental reason why a machine can't fix another machine, and there is no reason why there can't be a "universal repair machine" which also repairs copies of itself.