If you decide to go for RMA, on all the new models you MUST ship the WHOLE miner, you might get lucky enough to be asked to ship only the bad part such as a hash board
I asked them if i could send only the hash boards. Here is their response:
"If the hashboard is sent separately, the whole machine can not be debugged. It is possible that the repaired hashboard can still not be used after being installed. The warranty will be lost if the hashboard is sent separately, If you accept this risk, you can send it separately"