OK, mine died following the electrician switching the power off then on a couple of times. Given the there is no power on the external power connecter I'm assuming the power supply is gone. But are there embedded fuses in there that are likely to be the culprits?

Worked just as documented. You do have to press down on the screws when removing them to avoid stripping the heads. One note - make sure the battery connector is aligned with the socket or you risk bending the pins when you press down.

Contd..

In general, the instructions were very good and I had no "do overs" except as I note above concerning the cable. As I have observed on other iFixit projects, reassembly often presents different challenges than the disassembling and I remain unclear why the otherwise excellent guides don't yet include discreet steps for that as well. just sayin'.

Contd .. The other addition I have to offer concern removing the power supply: You must slightly displace the power supply away from the side of the case as there is a positioning bracket against which you will force the power supply if you attempt to use a simple "press and slide: approach from the accessible side of the power supply.

As several others noted, I had a struggle to get the antenna assembly reinstalled with proper alignment on all of the holes (disk and case). Part of the problem is that the back (curved) part of the antenna assembly must be slightly pried up so it can fit in the shallow recess on the outside of the case, otherwise the assembly will not slide back far enough for everything to line up. The rest of the problem I think was the "lump" of folded drive cable between the two drives due to the folding issue I described above. I was ultimately successful by slightly loosening all of the screws so there was a bit of wiggle space to get it pushed back into place.

Finished in less than an hour thanks to all those who went before. I was especially gratified by those who commented on the "too long" second drive cable. I just can't understand why the guide has not been updated to make it clear that that first fold(closest to the drive connector) should actually be a Z fold to take up the excess length due to the DEFECTIVE cable manufacturing. Guys, I just can't figure out why you have not fixed this issue by now. Thankfully, alerted by others' comments, I was aware of that and quickly identified that my "45 degree" folds, per the guide, were inadequate to take up the slack so I only had to perform a short REdisassembly to refold the second drive cable. Also, the cable I got did not have any fold lines on it but had been thoughtfully pre-folded but not in an adequate fashion as I describe above.