Folks,
Thanks everyone, especially for the counsel of patience. I've had the until for 2 weeks, and it has gotten better. Still room for improvement. I haven't watched the video, but will try things that don't involved opening the unit.
The Marantz is mechanically noisy--It makes noise when it spins disks. Nothing I can do with footers or placement alters it. Something needs fixing inside, and I have no skills in this area.
barry