We have a minimax 400 that we primarily use to heat our spa. My wife turned it on a few days ago and the water only warmed up to about 70*. I went to figure out what was going on and found that the only LED that was lit was the one for power. I have jumpered the hi limit switches, and the thermocouple without any luck or change in the LED lights. My next step is going to be ordering and replacing the thermostat circuit board. Is there anything else that I should check before I order this part?