My AMV8 is currently in the hands of Aston Martin NE but wanted to get some input from forum members. Recently, within the past week, I've been experiencing difficulting shifting gears in the higher RPMs. Dealer thinks it might be a clutch issue and is taking it apart to check it out but I haven't noticed any slippage and when I rode with the tech he mentioned the clutch felt fine and pedals felt "like new" despite pretty high mileage - however, I do know that clutches have been an issue in the past with '07 Vantages. Any ideas?