Its an approved facility. I bought the TX new. After some problems came up I sent the TX back to be checked out and upgrade the software and hardware to the QPCM version while it was there. Unit came back upgraded with a clean bill of health.
It has never been moved off its original 40mhz. I have of course often changed xtals in the 40mhz band but the module is a standard supplied 40mhz unit. The tx xtals have always been hitec and came direct from the supplier new in their bag.

All of the other rxs I have tried have been Dual Conversion except for the GWS ones. All the xtals in these rxs are of matching brand, within the original range (ie 40mhz) and are dual conversion xtals (except once again the GWS units).

Update:

I have just had a local Futaba design technician (recommended by some flying buddies) who said the 2x SS7 rxs were miles out in their tuning (I have never touched them internally) and the TXs output was well down.
With this information I am sending the whole lot back to Hitec to check again. I dont expect this to be covered under any warranty, I will happily pay for anything that needs to be done. I just want a reliable radio.
If they cant find any problems to fix this time they can keep it.