really sorry I didn't see this thread sooner; I was traveling. I'd like to explain a few things about Schoeps' reply.
What people here have said about water generally not hurting electronics can be true with some big "IF"s.
- IF the equipment wasn't powered on when it got wet
- IF the water is clean, preferably distilled (salt water in particular = death, or acidic solutions)
- IF all the water is removed and the humidity brought down soon afterwards so that exposed mechanical parts and leads of components don't corrode
- IF all electrical connectors and contacts are carefully cleaned afterward, including internal ones
BUT not all these things were true in this case. And more fundamentally, microphone capsules aren't pure electronics. They're electroacoustical transducers--mediators between two realms, subject to the hazards of both. And both aspects can be harmed by any intrusion of what I assume was more or less typical U.S. tap water. Pure H2O [shout out to Richard C.] could evaporate back out with no chemical interaction and no residue. For a regular stereo/hifi amplifier or the like, all you'd need to do is dry everything and clean the contacts and controls, because dirt is ever-present and it migrates into the worst possible places (Murphy's law). But tap water has all kinds of minerals and other stuff in it to varying degrees, and it leaves deposits, which can be corrosive and can create a path for electrical leakage.
The capsule in a traditional DC-polarized condenser microphone, despite being at extremely high impedance itself (especially at low frequencies) operates as a voltage source--so the gate of the FET (or the grid circuit of the tube) has to have even higher impedance, in the billions-of-Ohms range. If even a small region of the capsule's interior near (or on!) the diaphragm or backplate gets paved with something that's in the "mere" tens of millions of Ohms, the capsule will tend to discharge partially through that other pathway, perhaps intermittently, causing noise, distortion and/or loss of sensitivity.
What GLouie pointed out is also relevant. For microphones that use single-diaphragm construction, as all Schoeps microphones do, omnidirectional capsules are sealed (other than in the front, of course) while directional capsules have acoustic ports and some way of creating a precise amount of friction behind the backplate, so that rear-incident sound is delayed exactly as much going through the capsule as around it, thus meeting on opposite sides of the diaphragm where their forces, being in like phase, cancel out. (What I just described is how cardioids work; other patterns except for omni and figure-8 use the same principle but apply it differently.)
To delay a sound wave without diminishing it or altering its frequency response involves very precise arrangements of particular materials, including soft ones. If the thickness or arrangement of those materials isn't exactly right, the capsule's response will be noticeably affected. And if you get them wet, they may not dry out exactly the same as they were before.
So according to Microsoft Word I just used nearly 500 words to tell you that Schoeps is right; the capsule should be sent in for service. (The Colette cable was probably protected from harm by the presence of the capsule.)
And I'm sorry that this happened--I know the awful feeling.
But if it's any consolation, at Schoeps the same people repair capsules as make them full-time; in fact under current arrangements, capsule repairs are being performed mainly by the most senior person in the department--one of my favorite humans in my favorite part of the company, who's been at her job for over 35 years and has seen it all, and still cares.
--best regards