I just had a blade die randomly on a batch 8 S7. It now shows all dashes where the chips should be and 0c temp.
I'll be documenting the RMA process from start to finish and posting it here every time there is an update
12/28/15 Called bitmain US support and spoke with "Z", who directed me to zendesk and had me open a support ticket.
12/28/15 Created detailed support ticket containing all relevant information and a screen shot of the miner's dashboard showing the dead hash board.
Current status: Waiting for a response from bitmain.