December is the month of this breaking for me.
First off my Buffalo Terastation NAS box failed to power on. Solid red error light and no drives spinning up.
After investigation, the +12v lines on the PSU are down to +5v.
Hello Ebay. £30 later I have a complete but battered(dropped by the courier and the case is bent and squiffy) NAS of the same type on way to me.
Transfer the parts needed (PSU & main-board) needed and the new main board lets out the magic smoke.
Dead. 
Spoke to a chap in the radio club who is ex MOD circuit board/soldering type person and he takes on the challenge of removing and transferring an legged voltage controller (maybe?) off the original dead NAS mainboard over to the new now also dead NAS mainboard
With the faulty component replaced time to see if I can bring back life
Original dead board. Missing component transferred to new board
New board back in the NAS and it powers up 
but showing all drives are dead (Dave)
This time there is no power leaving the board on the +12v lines to power the drives.
Starting with one drive I plug it in and confirmed. The drive is dead.
Jumping the power from the +12v that comes in from the PSU into the mainboard over to the power that goes the drive I can get the drive to spin.
I start off with one drive and the NAS powers up. Its on the network and has an IP address and I can see the original NAS name and shared folder.
Web management interface works. RAID 5 array is not happy.
Yay. But the fun is not over yet.
Add a 2nd drive and the NAS makes a weird ticking noise and the drive does not spin. Oh
Using the spare drive that came with the battered NAS. The drive spins.
Now what. Well as the data is as good as lost. I decided to swap the circuit boards over from the good drive to the dead drive.
Plug it all in and the drive spins. Happy days.
Web interface up and RAID still unhappy as its missing its mates to make a complete array.
Try the 3rd drive. No power on the +12v. Jump the power.
Again NAS makes a ticking noise. Swap circuit boards.
Drive spins.
3 spinning drives.
Load the web interface. RAID 5 array happier and showing low free space - which is good. Array is much happier and the data in the file share is showing.
While the going is good time to start the process of cut and pasting the data over to a spare NAS I have. File transfer underway. 14hrs remaining or 220gb.
The 2nd thing that broke was the GPS for my LoRa tracker. Two new GPS pucks have arrived. One as a spare!
Thats enough for this month!
Cheers
John
M0VAZ