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Thanks David!
That video covers a ton of scenarios with these Sony Carousel changers.
With the hood off, I was able to determine that the player is stopping the carousel under trays with a disc in it. It's just having trouble TOCing(table of contents) the disc, pauses for a few seconds, then resumes rotating the tray in search of a disc present. It always acknowledges a disc in carousel tray #1. It very rarely confirms a disc in space #2, and is almost always successful at #3 through 5.