I don't have any mechanical guidance for you, but I did a bit of googling.
Here's how to clean that valve:
[embed|https://www.youtube.com/watch?v=VOUB1UiDkKc]
And this is a diagnostic for a similar, P0505 error.
[embed|https://www.youtube.com/watch?v=JI_3eMf7i18]
[embed|https://www.youtube.com/watch?v=WsP2-HKz7vE]
Also try poking around for solutions to P2441.
> The only difference between P2441 and P2440 is that in the P2440 the SVS is stuck open instead of closed.