Check ks arcade for replacements. Here's a new swemmer board https://ksarcade.net/swemmer-system-7-mpu-1d-2001-133-7-w-roms.html
Also here's a list of board repair guys. Have some good pics ready to send them including any damaged areas.http://www.pinwiki.com/wiki/index.php?title=Pinball_Board_Repair_Services