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I think Anthonyb has nailed it down. Look at the next two pictures. On the first picture of the left underside of the seat, directly above the black plastic cover, you cannot see the teeth of the arm that moves the seat up and down. On the second picture of the right side (side that is leaning, you CAN see several teeth on the right side arm. I think the arms are out of sync, either due to a broken gear on the right side or perhaps the motor jammed up at some point as Anthony stated.
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