I believe the blinking red light is described in the Kernel Log as "error_fan 4, normal_fan 2, fan_num 1". This error was showing up every 10 seconds in the log, but seems to have spontaneously stopped for the last hour and the red blinking light is off and now the normal green blinking light is on. I still think the miner is pulling too many watts. And I'm curious if others have the large difference in RPMs between the two fans. I described the issue to Bitmain in a support ticket. We'll see what they say.