well I got one with 5 hours on it and it was a factory defect I guess, Todd at AOA was great and replaced it with one that had 4 hours on it. so iv had it for few months maybe now it has 7.5 hours on it and a o ring on the piston let go and is putting air into the water system and then overflows the fill cap, anyone have this problem? just seems for such a expensive machine it should be doing this with such low hours on it. so now Todd's send me out the replacement parts and will video chat me through the repair which I'm not looking forward to. whats your guys thoughts and whos done the repair for any advice thanks