So I received a hot tub that is a little old. It’s a therma spa and the heating element went bad. I ordered what was supposed to be the same one. (My model is c2550-0535) the heating unit sent was a little different but seemed similar enough. After installing it worked perfectly the first day. However the next day it tripped my gfci breaker outside. So I guess my question is, is there a way to test the heating element or does anyone recommend a correct replacement for that model number? Thanks for any info and advice.