3 FTS, surely? 2 FTS disappeared some time in the last millenium.
I wonder if there may be a problem with the instructional staff after the aircraft come back into service as I was speaking to a grounded instructor over the weekend who has found other things to do with his time and he told me that he would not be going back into ATC flying.
Same thing happened to some extent on the AEFs. There is still a shortage of pilots now on some AEFs, nearly two years (I think?) since the latest grounding was lifted/