This trip changed from 10 to 8 days, and hokey smokes, it has an overnight in Istanbul.
rollcall/rollcall.php?trip=6172
https://www.rssc.com/cruises/VOY191008/summary
And this trip changed from 8 to 10 days, and now embarks from Athens, with an overnight in Istanbul:
rollcall/rollcall.php?trip=6173
https://www.rssc.com/cruises/VOY191016/summary
All old fares were removed from these trips from Fare Compare: