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CanadianSpaTech - Thanks again for all your help!! I did find a Circuit Board repair shop in town - unfortunately, they wanted $250 to replace just the two relays that were bad (not to mention the others). I did end up getting a decent price on a new VS504SZ Board as an exact replacement of my one that was blown. Got it installed this afternoon and everything is up and running again! Guess I took the long expensive way around (new heater, new top controller, and now new board) - but on the plus side - everything is new and should last years; and if it breaks again I've learned a bunch thanks to your help! With any luck I may even get to enjoy the tub tonight - although it's pretty cold in Utah and the tub water was down to low 40's... Might be tomorrow.

Just an update, decided to mess around with this today and everything went smooth as silk. Ran the 6/3, 40 amp breaker/GFCI outside, pulled the jumper and switched the dip switch and everything is running a-1. Ran a quick jet cycle and heat stayed on so looks like we're all set. Thanks again for the help!