5D3 All Drives Red (critical)

I was checking why none of my 5D3 shares were showing on my Mac. Initially the front panel looked normal with green LEDs but it would not connect to Drobo Dashboard or power down via the rocker switch. After pulling the power plug and rebooting all 5 drive LEDs were showing red. Drobo Dashboard showed the whole unit was critical.
I assume I have lost everything but I have backups for 2/3rds of the contents. What to do next? Are the drives a write off or is it a the disk unit? I have used a spare 6TB drive but after any initial green light the unit is now showing 5 red LEDs.

I’m glad you have a partial backup.
This thread may help:

Good luck