I have a Spa Builders LX-30 hot tub. I've done a lot of work to it. The board has been repaired, new pump seals, new start capacitors, new transformer, but now its in watchdog mode with ---- on the display. The owner wants to get this working, but I'm at a loss now. The temp sensors have been checked, and are both within spec with temp changes. The only thing I can think of now is capacitors on the board. Is there anything else it could be?