HOW DO I REMOVE/REPAIR THE DRIVERS SEAT ON MY INFINITI?

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THE SEAT PORTION IS LOOSE AND ROCKS. THE ATTACHMENT TO THE RAILS IS FINE AND THE ELECTRICS FUNCTION PROPERLY. THE SEAT BOTTOM SEEMS TO BE ATTACHED TO ANOTHER PIECE THAT IS ATTACHED TO THE GLIDE RAILS. THE WHOLE MECHANISM GLIDES AND WORKS PROPERLY BUT I CAN LIFT UP ON THE SEAT AND IT LOOKS AS IF THERE IS A PARTIAL SEPARATION IN THE SEAT.