After some research I have found off a WRX forum that at least on that car the solenoid doesn't actuate in test mode and also having 12v there doesn't mean it should actuate, something about the current. So I've just run some UEC through it and reinstalled it. I read a bout someone fitting an LED to it to flash when its active to see what its doing, maybe that's and option for down the track.
As for the vac lines, I think I will leave the some of them as they are, especially the boost control ones as they seem to be sensitive to size and length, they have numbers conveniently printed on them and really, they don't look bad at all. Some of the others on the manifold though have been so hard they break in my hand, so I think I'll do replace them on a case by case basis. I think tomorrow I'll bite the bullet and clean out the BBoD. I have had it off and had a look inside and now have an idea of what to do. The lines in there looked in good nick too so I might just clean those and the solenoids out too. Really if I I had issues in the car's running I would be more keen to replace things but its running really well. The only problem I have relating possibly to BBoD and vac lines is that it seems to swap to twin mode rather early and then if you back out of it before the secondary spools it seems to stay in twin mode and just bog down for a while unless you back off and start again. I think this may be a TT'ism though, but have read about (don't know which) the line witch gets blocked up with blow by gunk and causes similar issues.
Im keen to try the line one mod with the 0.8mm pill which I think seems to hold merit as from what I can see it just slows the rate that the ECV opens. Makes sense to me anyway.
Cheers
Josh