My Two Successful Changes
With a saver first award from WAS to BKK booked before 1 FEB, I was able to change the following flights for the same dates:
IAD-UA Y>YUL-LH f > MUC to IAD-LH F> FRA-LH C > MUC
and
FCO-LH C > FRA-UA F to FCO-LH C > FRA-LH F > IAD
There was no mileage change required, though there were some issues with recalculating the taxes, but the agent worked it all out and knew the new rules.