Spektrum SR3100 reciever won't reverse
I've got a Spektrum SR3100 reciever in a Scorpion rock crawler. Tekin FX-R ESC and T55 motor. I was playing with it this afternoon and the reverse stopped working. I tried to re-bind it, made sure the ESC was set up. Nothing seemed to work. Steering and forward are fine. I tried a different S3100 and all functions are ok. Could this reciever be fubar'd? Is there anything else I can try?