Please help, actuator issue

[A3Dec]

My actuator is making this noise, I was told it’s not holding vacuum and I’d need to replace it. I’ve replaced it and it’s still making the same noise. I’ve vacuum tested the pipes that go to it and they seem to hold the vacuum, I did have the codes shown before I replaced the actuator but now I have no codes and still the same noise, any help would be appreciated as I have no idea what to do. It’s a a3 sportback cbab engine 140bhp.