I think that is the controller board. It has an FPGA on it. To get a replacement, you go do a lot of basic simple correspondence. To start, ask Avalon and burnin if they will ship you a replacement. Ask what damage trade-in price they will give you.
I've emailed Avalon and just sent a PM to burnin as well. Thank you.
While you are in the midst of a misfortune, your device is nonetheless valuable to the community, so continue to treat it with care. It documents a failure mode, and the process of examining it should give insight for design improvements, and practice for the soon to be important repair business.
The rest of the community also wants to know how to get replacements, and who will be helpful when disaster strikes. It will strike. Yesterday we had 2" hail and violent weather. I could easily have taken a lightening strike and had the same mess. Other people will have different issues, perhaps a mouse seeking a warm place to sleep, a dog marking territory, or a wife disappointed with a relationship with a secretary.
I would be very conservative. If the module is damaged, it could in turn damage a replacement part. I would run the unit with 2 modules to be sure that the repair worked. I haven't thought through when & how to bring the suspicious module back online.
Again, take photos of each item that you remove. Perhaps on white butcher paper with a carefully lettered 3x5 card with date and description.
Especially, take some close up photos of the controller board, front and back.
You might create a new payment address and put it in your posting signature, perhaps one or two Avalon owners can send a bitcoin or two as a hand-up.
Thanks, once my emotions settle down a bit, I'll dig into taking everything apart and do exactly that. If someone has access to modify the wiki, they might want to add a note about ensuring power is properly distributed to help someone else avoid this tragedy.
I'm also wondering if I should just sell the modules in an attempt to recoup my costs. The temperatures were fine last night and this morning, so I would be surprised if any of them were damaged. I was getting over 90GHs. Maybe a long escrow could handle that. I don't know. I'm not sure where to start with that or what the market is for them. I'm open to any advice. I feel I should wait to hear from Avalon or Burnin or someone else regarding replacement parts, but I also realize an idle miner is terribly wasteful. I feel like I should move direction or the other very soon: 1) Get all the parts needed ASAP 2) Put the parts up for sale ASAP.