I recently been having a problem with my spa. I just replaced my circuit board (6600-288). Also have a rev 5.56 chip in it. I now have a problem with my wires from my circuit board to the heater getting hot and almost melting. They turn black but do not smell like a short. I have had to replace the ends on them twice already. The same for the wires going into the board for the power. All 4 get very hot and turn black. The hot tub still works, heats up, but i do not think this should happen. let me know what you guys think.