Sounds like you are going to have to search them all out by yourself. Of course, that poses a question -- once you do figure out any changes / new frequencies, are you going to submit them to the database so the next guy who comes along can benefit? I only ask because if things truly have changed, nobody has submitted any changes yet or the database would be updated. We don't update the database based upon FCC information -- we update based upon submissions of confirmed data.
So in this case either you are going to do the leg work to figure out the changes, or nobody is -- based upon the fact that nobody has yet
Mike