I have an in ground 850 series Sundance Optima that was installed in 1999. I am unsure if the spa is a 97,98 or 99 model, but it has a 6600-018 circuit board. I needed to disconnect all of the wiring in order an issue with a tripping GFCI, circuit breaker. I reattached all of the wiring with the diagram provided on the inside door of the panel but can not find how to reattach the wiring to my heater. I am looking for where to attach the green, red, and black wire to my heater. The heater is a 6500-214, the stainless steel type with a 90 degree angle/elbow.