Totally bricked PR4100 - drive LEDs blinking red?

My PR4100 has been working fine for two years, but in the early hours of August 25th it disappeared from the local network.

Looking at the device itself, no disks are spinning and the only signs of life at all are the drive activity LEDs, which are ominously blinking red in sync with each other. The power LED and the display are off.

No amount of off-and-on-again or 4/40 second resets are having any effect. I’ve tested the power brick and it’s putting out the proper requirements, so the problem doesn’t lie there.

WD Support have said that as my 2 year warranty expired two months ago, they’re not interested in helping me out.

So, anyone here have any ideas?