I have a very old Tiger River Spa. It has a Watkins Jet pump and Watkins No-Fault heater. It has been running with no issues for years. The other night we went to use it and water was lukewarm. I realized the breaker had tripped. When I tried resetting the breaker it keeps tripping. Doing a search online yielded the most plausible theory was a bad heating element. So I disconnected the hot from the heating element and still trips breaker. Then I reconnected the heating element and disconnected the Water circulating pump and breaker stays on. Then confusion set in because I plugged that back in and disconnect my Jet pump and breaker also stays on. Is it possible BOTH are bad at once or does one rely on the other or something? How can I isolate which part I need to replace?