When my sweet 16 needed a new mother board I called the Main Handiquilter customer service number in Utah. They sent me the board and instructions for $100, my hasband replaced it in about 10 minutes.
Is the person you took yours to a ( real Handiquilter dealer?) The first 8 years of having mine I didn’t have a local ( within 100 miles) dealer/ service rep) and I called Utah for everything. They were great trouble shooting over the phone & helped me with many things, including rushing parts to me when needed. Now I have a local dealer and he is great, fast, helpful and saves me money.