Yes, there were problems with the Viper, maybe about 2 years ago. I bought one from my local dive shop. The dive shop owner said there were problems with the Viper and Dacor replaced mine with the new Viper America. No extra charge and an upgrade, for sure. Tell Dacor you knew there was a recall and you missed it, maybe they will replace it.
My Viper worked well I noticed no problems, but my dive shop offered the exchange so I went for it. Now I remember, Dacor was not making the offer public, they would only make an exchange if the Viper owner complained about something like noises or hard breathing. My dive shop owner is very honest and a people person so he asked me if I would like the exchange. That was real nice of him. I love the Viper America with a Viper Octopus.