I cant remember the link but someone posted a company who deals with mechatronic replacements but I cant remember which thread it was in.
think it was 1600 all in but dont quote me on that.
If you know your way around the car you could try yourself (if you know what your doing)
There is a video on youtube you could use as a guide.
drain the GB fluid, drop them box then replace the mechatronics, its like a big sensor inside the GB