CEL P0411, has new pump and check valve

[cjharris02892]

Checking out a car for a friend to buy. Car is a 2003 9-3 with 94K. It had a new SAI pump and check valve at 78K. Throws a P0411 and apparently did before pump/valve replacement and ever since. Code was cleared but comes back.

I had someone start the car while I checked the pump outlet, no air coming out and check valve is fairly clean. I do however hear kind of a hissing sound for aboiut 30-60 seconds after car is first started.

I'm wondering if the pump or a connector is leaking.

Can you give me the fuse number and relay number that controls the pump?
Are these pumps or connectors ****e to cracks?
Could the pump be bad after only 16K miles?
Is there any other part of this system that needs to be checked as part of curing the CEL?

Thanks in Advance.