Congratulations on your new little one. The newborn screen is how we found our daughter's hearing loss as well. They told us that its very, very common for the test not to work right, and for non-issue things to cause the false reading- and that is true. So, that is in your favor.
For us, they even tried to tell us the machine was broken, as, "they've never had anyone test abnormal". Unfortunately, our daughter became the first baby born at our 100 year old hospital with an early diagnosed hearing loss.
We had three OAE tests (the normal newborn screen), and then were referred to a University hospital for another OAE, and then eventually an ABR under sedation.
If you want to compare notes, it sounds like we're in similar situations. The people here have been a good resource for us, and I'm sure they will for you, too.