Im not sure if Rossair is going to operatie with ATR42. In there commercial adver. they do ref to ATR42.
At the other hand Ros Europe has already returnd 2 B1900's
And the rumor is that they are in deed problems. So maybe the other B1900 and ATR42 are coming back as well.
Look also at the fact that Euromanx is know in hands of EasternAirways. And Ros was the supplier of Euromanx?