Good afternoon. A month ago I changed clutch and thrust bearing to an F430. After this, they have traveled 100 km without any problem. After this, it was parked for 3 days and now is where the problem comes from. When I start it, I notice that the gearbox fault light comes on, I make a diagnosis and I get P1742 gear selection position sensor failure. I checked all the wiring, I tried to do self-learning. When I manage to do it, I go out to work on the car, and at 5 kms the same error comes back to me. I'm almost sure that he was able to catch air in the circuit, so I do not know whether to disassemble the actuator to purge or not. Can you give me any advice? Thank you and excuse so extensive text.