I've had my DSV since they came out. I really like it. Recently I have had several dives with my DSV equipt Kraken and it has been breathing WET! Well, damn Sam. So I took the Kraken apart to inspect the exhaust mushroom. It looked clean and just like it was installed yesterday. I carefully inspected the red hoses. They looked as new despite a ton of dives on them. I looked at the DSV and it looked just fine. I tried to get it to leak, but it wouldn't. Hmmmm..... So I dug through my goodies. I found the bag that the DSV came in and Bryan had included replacement O - rings. Well then... I replaced the O - rings. Today, I dove the Kraken on a wreck in 50 feet of water for about 40 minutes. No leaks!
So, if your DSV is breathing wet but seems fine and everything else checks out, disassemble, clean it up and put a new set of O-rings in it and you will be back in business.