Hello, can anybody help me what to look for please?

I have A6 BiTDi 230kW, it started to go into limp mode. After logging with VCDS, it shows that some "turbocharger inlet valve" open circuit. Advanced values shows that "Bypass valve f high press turboch turbine inlet" is not opening / closing as expected. What to look for? I tryed output tests with VCDS and nothing seems to be faulty. wastegate actuator on big turbo operates freely, same for control circuit for smaller turbo.

From log, it should be some valve on smaller turbo, but which one? What part number?

I am really desperate from this issue, please help anybody.

Log here :
Log-TURBO2.txt