Hmm actuator fully wound off and it's boosting to 12psi (with a very brief 14psi spike sometimes) Never had this problem before, it's just developed since the last top end rebuild. I've just ordered a clutch (long story) as I lunched my box at the weekend and have a spare box to fit!

Can't get my head around it!

Want the boost problem sorted before I take it to AVA and look like a helmet when it cuts whist they are trying to set it up!