Very sorry for the confusion.
Scenario 41 - 13B should be 72A.
Scenario 48 - 68B should be 66B.
Changes have been made and are included in all future La Fiere Bridge scenario books.
I'm looking at my scenario 41 and there is no 13B and no 72A...so, what is the real answer?
How about just posting the map setup online? I'm showing a 13A and a 72B next to it.