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It could also be at the seam where the slide tries to extend and drop, or retract and raise. This requires someone to lift up the flooring while someone operates the switch a maybe with the remote. The clue is that it moves for a while before you hear the noise.
Maybe the cable/hose guide got mispositioned and is creating interence. Sounds like you might also need an extra set of ears and eyes to watch the interaction. Be careful not to pinch or hurt yourselves. The power of those slides would make me nervous but you've gotta do what you've gotta do.
Please post what you find. I've never heard of this problem before and it will be interesting to know what you find and how you correct it. Best of luck.
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