I think there's a way to tell which plane you may get a day or two in advance.

The ones that have AVOD right now should be those planes that were recently converted from domestic FC configuration to BF. If you look at the seating plan in coach about a day or two before departure, you will see seats 7ABC which do not exist in the original BF-configured 752s.

So, I believe 7ABC = AVOD + 110V power for BF.