There were very long lines at the Senior/Disabled pass office next door as riders who had not upgraded to the new CharlieCard Senior/TAP card found their old cards were no longer valid with the changeover. Senior and TAP customers have been urged to get the new card for over a year but many didn't heed the T's warning. Expect long lines there for the next month or so.
Also if you have stored value on a CharlieTicket and want to transfer the balance to a CharlieCard the service center can do that as well. Looks like the T did a good job addressing this concern. In New York if your MetroCard fails you have to go out to Brooklyn.
What worries me is why my card failed in 4 days.