Export your ARS routing and dialed digits (and any other possibly affected forms before hand, which may vary depending on complexity and how how well you know the system) just in case... But if memory servers me correctly, you can restore the database, then go into hardware config and it will show the incorrect card type installed, change it and save, then go into framer configuration and change it to the appropriate type (T1/E1) and everything should be right with the world again.
Take this with a grain of salt though, it has been a long time since I have done this, probably 5 years, but iirc the T1 card was not an issue when switching the platform.
