they changed the rule regarding downgrading after af posts they will now prorate (i spoke to a agent after seeing someone write about it)
I just called
Agent read to me from her workflow that they generally will prorate af with downgrade
But that it can depend on use of card credits.
Sounds like if you use the travel credit 1st they will dedict from af refund.
I didnt use credit, downgraded and waiting to see what will be with af reversal
Thanks for the update regarding the possible prorating.