Hello, I understand, I 'm there with you, i'm the same situation, I have a 2008 Vita spa, have a issue with 1 pump, working on low speed and popping a fuse with on high, last week, issue started with blown relay, from heater, we think, fried the circuit board, got new board, it was bad,( I'm glad they did it, they warranty the board) your right, there not returnable) Thats why I'm , having a spa repair done by local company, i've worked on it before, but when its getting to be expensive parts) I'll let them troubleshoot it) my problem is all we get on my display is SS , and won't get into programming mode or the Heater won't even work, and they can't figure it out either, (the sensor checked out ok to) we're about out of options, best of luck.