Be cautious around those scoring displays when they're on. They'll shock the crap out of you. Your rectifier board connectors definitely need replacing. Get a crimping tool if you don't already have one. I bought this one off of Amazon and it works fine.
https://www.amazon.com/HT-225D-Cycle-Ratchet-Crimping-interchangeable/dp/B007JLN93S/ref=sr_1_1