Welcome to our forum.
What year is it? If you get me your serial number I can figure out what system you have. Once we determine if you have the old style or the new ones we can walk you through troubleshooting it.
So your spa was manufactured 4/08/05 installed 5/28/05 purchased by Antonio Argyropoulos in Hanover park IL
As far as the lights go you could check the circuit board and make sure the connections are ok? Do you have waterfall lights?? Possible corrosion on connection there?? Worse case you need a new main light assembly or circuit board.
I removed the LED light in the foot well and there were two burned bulbs in the 24. I ordered a replacement light for $230 and am hoping that fixed both the under water light and water fall light.Since the Waterfall light is tied into the 1st floor light, do you think this will fix both?Thank you,Shane