[Coda]

Leaking capacitors is a fairly common failure mode for power supplies. Of all of the components that go into modern electronics, capacitors are probably the hardest to test during production. A transistor, resistor, or diode that doesn't do what it's supposed to do is fairly easy to detect at manufacturing time, but a defective capacitor still behaves as intended -- it just overheats and leaks or swells after a few months or years.