It is not going to be an easy fix. How handy are you? You may have to remove the seat to get to the motor/wiring. These are some tests I would do.
1) Can you move the seat for/backwards? If you can then all electric/fuse is good.
2) Can you hear the motor runs/clicks when you activate the recline switch in up/down direction? Yes - then electric is good. It is mechanical problem.
3) Can you move the back further down? If you can then the power is good to the motor but only in one direction. The switch reverse the polarity.
4) It is possible the gear is off the track. The back is driven by cables to both sides of the back seat using one single motor.
All the motors on at the seat bottom. You can locate the recline motor and jam 12v to the wires, reverse polarity to drive in other direction. It is going to be a hard nut to crack. Good luck.
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