Hi!

it works perfectly, and very quietly.....until the compressor shuts
off, then it sounds like you put a handful of marbles into a metal
coffee can, and shook it. *Sometimes its VERY loud, other times
not so much.

I will practically guarantee that your refrigerator is suffering from
aged rubber mounts on the compressor motor. They can be replaced, cost
is a few dollars and maybe a half an hour's worth of work. The heat
produced by the compressor slowly hardens them, and when it does, you
hear that motor come to a stop.

Even if you don't do anything about it, this noise is unlikely to have
any effect at all on the life of the fridge.

William