Fuse box

I know this has been discussed extensively... But I recently bought QV coupe with non-working ventilator switch... The problem led to few connecting points having melted between fuse box contact and relay connector for ventilator system... Past owner made feeble attemt at soldering but safe to say didn't achieve much success...

Having reviewed some of the wisdom shared and discussed on Ferrarichat, it boils to eventual weakness of contact and delaminaion and eventual reduced voltage and affecting other relays and system especially the vent and fuel system.... Is the only true fix, exchanging with rebuilt circuit board? How do you feel about the system from GT Arizona? Thanks