Does anyone know if there is a way to service the rear seat, drivers side intertia reel unit ?

The seatbelt will not rewind fully into the reel.

I have tried fully pulling it out and then carefully letting it rewind, but nothing seems to work.

The belt appears to be in good condition and I am not aware of any incident where pre-tensioners (if they exist on this model) have fired.

Any comments re removal and replacement would also be appreciated.

Mike