I have an Opel Astra H Caravan 2008 1.7 CDTI 81kW (type 0035/AHO). I started having some problems with the turbocharger. After reaching a certain velocity on the highway the car suddenly loses power and the yellow service led lights up. In my auto service they solved the problem by fixing the turbocharger's waste-gate actuator (moving it back and forth) - it was stuck. They also said, it could happen again and the real solution would be replacing the turbocharger. This problem happened twice this year, in both cases the service unstuck the actuator and then it worked for a while.
Should I really replace the turbocharger? Would it be possible to change only the actuator (which is much cheaper)?