About a year ago we had a couple of Netgear GS108 8-port switches at work that died and were being thrown out. I took one home; it's been sitting in my junk pile ever since. Finally popped the case open this evening to have a look, and lo and behold there were two obviously failed capacitors on the circuit board (tops of the caps were bulging). The failed caps were TEAPO 1000uF 6.3V units, which were one of the type of caps which were infamous back in the days of the motherboard capacitor plague. I'm kinda disappointed that Netgear was apparently still using these dodgy caps up until about 5 years ago (my guesstimate is that this switch is 4-5 years old).
I still have a sizeable stock of spare caps from several years ago when I was recapping a lot of dead mobos; I rummaged through the pile and found a bag of United Chemi-Con 1000uF 6.3V -- exact same electrical specs as the failed ones. They're also exactly the same diameter, but slightly taller (but still short enough to fit inside the case when it is reassembled). I swapped out the two bulging caps, and put the switch it back together; it seems to be working! I just tested it by transferring a 4GB file through each port (in both directions), and verifying that it was transferred error-free.
Looks like I can move this one from the junk pile to the spares pile now...