I have a 2096 J470. Recently replaced circuit board, temp sensor, hi limit temp sensor, heating element and a pump. Spa was running great then we had a power outage. It threw a watchdog code, reset the spa and it worked again. After a few days it started having problem. So again. The display says 104 but the water will only reach about 80 degrees. I've reset and open valves to check for air lock. Also replaced the temp sensor again. Any suggestions?