The GFI breaker has recently has been jumping lately. Whenever the heater kicks in a few minutes later the breaker jumps and one if the leads coming from the breaker gets hot and smokes a little. Here is a picture of the lead . I tested the breaker with a volt meter. 117 volts from each hot lead to ground and 234 from hot lead to hot lead so it appears to be working properly. I checked all the wiring for shorts and no luck. I also poked around the wiring looking for one the may be hot which was not the case. I even pulled the filter figuring that maybe the pump was working to hard. Any ideas for trouble shooting?