I have had a problem with the secondary air system bank 2 for years now in my 2003 manual S. Here are some specifics:
The secondary air pump runs in the morning if it is cold
I've replaced the Secondary air change over valve, the secondary air cutoff valve and the secondary air check valve. I was hoping carpet bombing would work, it didn't.
I pulled a vacuum through the secondary air check valve with a vacuum pump and it held vacuum.
I pulled a vacuum on the long plastic hose for the fuel system regeneration valve and it held vacuum
I pulled a vacuum on the hose leading to the fuel system regeneration valve and it held vacuum.
Using my scant Durametric knowledge here is some screen shot data I'm hoping will be useful. If additional data is needed let me know and I'll fetch it.
Any insight using the above data would be greatly appreciated. I'd love to better understand what the Durametric is telling me, but I'm not there yet.