[100K+]

Ok Your engine is only single turbo and suspect *3964 may be used in a different way on my engine than yours, but the method of operation should be the same across all engines.
I'd try to flush it - see what if anything comes out.
Try to get Vida to operate it.
After that other than trying a replacement I'm a bit stuck.
If you did get an ebay special, you could play with that trying to take it apart - if it gets broke its not a total loss, you still have the original, If you do get in and clean it etc thats a win win.


Perhaps others might offer a fresh insite..

Cheers
Bob