Have you tried tightening the bolts? A drop of Locktite (or equiv) might be helpful. I suggest the non-hardening kind.
Why not let the dealer handle it? A loose seat can be very dangerous in a crash and not something to work on if you are not sure of your abilities. If you can't figure it out by looking at it and checking the drawings in the FSM, maybe you don't need to be working on it.
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