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T'rex controller fault

I have a new t'rex controller I intended to use with a wild thumper 6wd. While setting up the rc controls and testing the motor direction/reversing, I ran into a problem.  One of the motor outputs stopped working, and the fault led came on.  Both outputs were working initially, for about 20 seconds in total. But now this motor output goes straight into fault mode on power up.  Using a charged 7.2v NiMH pack btw.