Mine had a similar prob, that is one side had snapped, fat bastid that i am my fault.

Take seat out completely, then turn upside down you will see some large staple kind of things.
Prize them out with screwdriver and then just start carefully removing all the fixings that hold it together.

You can pull back the cloth and foam to reveal the problem, and attempt a cure.

Mine had to have a weld. We then covered all that was visible in wet towels, as welding and Recaro foam dont mix.

Hope this is some help.

Dickymint