Originally Posted by gar  061006-1432 EST USA
Geof:
Your comment is a good one. Certainly cooling the regen resistor is a good first try. Does the over temperature give the same error code as overvoltage? I am not where I can look at a manual at the moment.
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I am going from memory regarding overheating the regen resistor on our 1995 HL1; I think on more recent machines the alarms are separate. I also speculate that if your DC buss is running near the top limit a hot regen resistor could push it into overvoltage simply because the regen resistance has increased. But I also speculate it might be an open circuit in the regen resistor because servo braking does not really dump that much energy.