As said previously, there WON'T be a 1 for 1 replacement, maybe 12 or 13 for the 17.
I did hear recently that the down time on the -42 is way longer for a "C" or HMV check than they are currently used to with the 340, so the 2000 came back in for a closer look....
However... nah can't tell that story, too close for comfort.
Tight wads, could have sent some of the TRG Staff to Froggy Land for a wee jaunt.....