Well, Electronic M and Zeno were right on the money. The cup's got two holes on the bottom of it (but just one in practice as you'll see), and someone obviously attempted a repair.
More electrical tape under cup
One of the holes filled with black goop
Bottom of cup
Not only that, but one of the screws holding the cup to chassis is missing.
Doesn't seem like something a tech would do. I'd almost guess an enthusiast tinkered with this one not too long ago, and perhaps decided it was beyond saving... Or, more than likely, the second hole is fresh and unrepaired.
Looks like I'm gonna have to figure out how to use silicone... Or anywhere I can just buy a new one...?