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HI, I have an older Sundance Spa. Recently I replaced the filter, the pressure sensor (precautionary) and the circ pump as it had failed. The spa now works almost perfectly except the HL warning keeps tripping at 93 degrees. If I re-set the GFI I can normally make it run for a few more minutes and get to 94 or 95 degrees and, if I'm lucky, I can keep repeating that and get it to 100 or 101 before it cools back to 93. Any ideas what could be the cause? I've attached photos of the unit. I know the HL sensor is the second red connector on the top right but not where the thermostat is or if there is a "heat well" to check? Is it possible there is a blockage after the heater that is causing to water flow to slow and peak in the heater element (if that's where the temp sensor is)? Thanks Rob