Here's an interesting twist that sort of fits this thread (haven't found a better home...).

Upcoming flight booked in economy for ~$1700 one way. A few days out the Premium Plus fare dropped to ~$1300, so I changed the ticket to get into the premium economy cabin. Because I was only changing cabin (not flights) I did not get a refund or FFC for the fare difference (which I'm OK with). But now the projected PQD earnings are clearly based on the new fare ($1300), not what I actually paid for the ticket ($1700).

What do folks think:

1. Guesses on what will actually post after the flight? (I'd assume ~1300?)
2. Assuming the lower amount posts, do I have a case to argue for PQD earnings on the full amount paid? Or did I give that up by making the voluntary change?