I forgot about this topic.
I ended up sending my bad board to BitmainWarranty and they fixed it, cost about $200 but it is running again. I do get more HW errors than before, but fuck it...it is hashing.
There's even people that get back broken miners after sending them to bitmainwarranty, better than nothing. How are temps? Could be why there's HWs, or just a bad repair. Avalon might be a better choice in the future, their products are more reliable in general than Bitmain's.