Control unit of steering defective… 3.0 TDI GP3 Help…

Hello together. At my VW the control unit of the steering gear is out of the blue. Lt. VW specialist workshop there is the part not individually, but only as a unit. So the steering gear (?) That’s how it is in the KV. Costs incl. troubleshooting etc. 2.900 Euro. Isn’t there another solution? My VW is EZ 02/2011 and has run about 136,000 km. Alone the spare part costs 1.440 Euro net. I’m not talking about money but about the principle. Small cause with large It has an effect.