I'm not really "worried" per se. If I truly was, I'd be calling the dealership everyday. I let them have their time to figure it out with GM and they can't come up with an answer. So, I am taking it to another place rather than complain to the current dealership, which will probably get me nowhere since the current shop manager won't call me back.
I don't care what the book says - the DIC went from 100% to 50% real quick and has read 50% for 6+ months. Something is wrong, plain and simple. I'd like to get it done now rather than worry about it at 37500 and GM says, "Oops, too bad, your warranty is up." Yes, I realize the filter change is extremely easy but if there's something wrong with the electronics....that could be pricey.