Corona, Webra, Dallasy, Cirrus and Fleet are best and I have all of those and compatible crystals.
Corona 40MHz synthesised ones are available from the HongKong Ebay shops, delivered in about 5 working days from rcecho. The 6-9ch is 1x2x 1/2 inch + pins. You can (1) disable failsafe
on V2 or have (2) sustain or (3) all channel failsafe, programmed at bind. Don't forget you need a transmitter crystal.
My mention of Corona
here was purely to see a clue what was happening on the red
radio signal light . It was never going to be a factor in the fault.
But 40 MHz FM sets didn't disappear into a void and you find plenty of modellers still have the gear so spend a bit more time asking friends and looking on Ebay. There are bargains to be had. You can give me a bell by Sunday if you are stuck and I'm not making a penny by doing this. Contact details are found by hitting the left hand web link.