chabinator

Hi, my 2004 mazda rx8 100k miles has a p0661 code.

I swapped the ''ssv solenoid valve'' with the ''air solenoid valve'' to see if the code would dissapear. The code stayed there.
So, it's probably not a solenoid malfunction.
What else could it be?
The dealer found there was no vacuum on the ssv actuator..
HOw do I repair this????

thank you