I'm just a dumb terminal that has managed to keep a classic A3000 alive in her Elbox Tower these last twenty years, but check out the skills of this guy here. Looks to me like your board's 'wound' would be just another day at the office for him or others like him.
https://www.youtube.com/watch?v=vx50YtEC2S8'RetroGameModz' did advertise his doctoring services on AmiBay/EAB a few years ago - not sure about now. But he was/is not the only one. There are several - as well as the guys at AmiKit. Sniff about. You will find them.
Good luck. Hope it works out.
