I purchased a used Thermospa Concord hot tub recently. Not sure the year though because the sticker was taken off. The person indicated there were no issues with it but that is not the case and he is not responding to me. After I got the electrical hooked up, the topside control wasn’t working so I replaced it with a balboa ML700. That now works and heats up and the circulation pump runs. The blower initially came on a few times while I was testing everything but now it will not turn on at all. It also has 2 other pumps that turn on for about 10-20 seconds but then shut off. The light in the hot tub does not work either. The circuit board has some corrosion on it (see attached pictures) and I am wondering it that could be the issue. I have a multimeter but not sure how to test the board so I would appreciate any help this knowledgeable group can provide.
thank you!!