Hello, I need help from someone who can trouble shoot with me. I'm an electrician so I can run tests if I know what to do. I've got a 10 year old "Marquis Spa" hot tub with a "Balboa" 52753-03 MT SUV controller. All of a sudden I have no display, no pumps running, and no heat. Power is on. Can anyone tell me where to start? I checked the fuses I can see.....all OK. I hear a relay clicking every so often. Thanks in advance. John