I was going to write this earlier, but now that you've asked...

Not knowing what is and isn't working, you could just remove the 3-in-1 all together since you have an aftermarket gyro. Just use a brushed ESC of appropriate amperage for the main motor (GP c-12 is $23). If the RX is fried, get a 4 channel Corona at BPhobbies.com about $20. Use the chrystal from the old Axe RX and you're up and running.

Sorry for your loss...[]