By the way, after pulling my refrigerator away from the wall and removing the little cardboard panel that covers the compressor, I haven't heard the compressor make that knocking noise. The fridge is still sitting in the middle of my kitchen floor so I don't know if moving it back will have any effect. Not sure why it would unless sitting in a corner creates a lot of heat build up that stresses the compression and makes it act up.
Thanks for what you do. You've been a great help.