Thanks a lot. Without the instructions I wouldn’t have tried at all, but now I did. Not to upgrade the drive (which I guess I should have, seeing how much effort it was), but to replace the fan, which was going to fail. Apparently it had too much resistance to run well at low speeds, which was compensated by running at full speed for some time every half hour or so, even when the drive was not in use.
In my 2 TB TC, there were some slight differences/things to be aware of when taking out the whole frame. There is a third tiny cable that you need to disconnect before you take out the guts of this thing. It has only two wires (so this is the smallest of them all!) for the reset button. All in all there’s connectors for power, fan, status LED, and reset button. Also, be careful with the ports part; you need to slightly slide them out of and into place (just a few millimeters). Lastly, the 2 screws in the ‘bottom’, holding the contents were T8, not T10 in my case.