So it's Oceanic's fault that you did not dive it for a year? Why did you buy it in the first place. If anyone is to blame here it's whoever talked you into a $600 computer that was not going to get used. They did a rebuild once. There is a one year warranty. You obviously did not tell them they had rebuilt it before you sent it in. At that point they could have informed you that there is a one year warranty on rebuilds. Oceanic seems to be going above and beyond. As an Oceanic tech I can tell you that it is not something a tech can address. It is a factory issue since tech;s do not have access to the electronic components. All of the stuff is integrated into them and you can't just go in and replace a sensor.
What I would have done is gotten the comp back and dove the hell out of it for a month. Even if it meant going into a 15 ft deep pond or swimming pool and made sure it was OK. Was it actually working and did you check every function when you got it back? First thing I would have done.
And I'm not a lawyer, but now that you have posted that the computer is defective and reads incorrectly, Oceanic is not the one who will likely get hit with a lawsuit or perhaps criminal charges if you give it to a kid's club and somebody gets hurt. Stuff you write on the internet NEVER goes away. I believe the term could be negligent criminal homicide if some one dies. Your actions directly contribute to the death of an individual because you knew the item was dangerous yet you did not inform them of such and you allowed some one to die over $160 bucks? Guilty.