I just got back from the Mercedes dealer. They had a fairly new sedan there with all the interior stripped out, except for the 12 miles of wires. The whole floor was wet and it was rusting in places and they wanted an estimate for the rust repair.

It turns out that a mouse chewed the condensation hose and the water then drained into the car rather than outside. In time things started to short out and warning lights flashed on and off and so the owner figured something was wrong, finally.

You would think musty smells and condensation on the windows might be a clue....!

The moral of the story is that you are doing the right thing by having it looked at. Also, it might be something your insurance can handle under your comprehensive coverage if your dealer won't cover it. There are a lot of scenarios here to consider if insurance is involved.